CompuServe

CompuServe, Inc.
Company type	Public (formerly)
Industry	Online services, telecommunications
Predecessor	Compu-Serv Network, Inc.
Founded	1969
Founder	John R. Goltz, Jeffrey Wilkins
Fate	Acquired by AOL in 1997; brand discontinued by 2002; service terminated in 2009
Headquarters	Columbus, United States
Area served	Worldwide
Key people	John R. Goltz (first president), Jeffrey Wilkins, Robert Tillson, Charles McCall, Maury Cox, Robert Massey, Sandy Trevor (developer of CB Simulator), Steve Wilhite (creator of GIF)
Products	Online information service (CompuServe Information Service), file sharing protocols (CompuServe B protocol), CB Simulator chat system, Graphics Interchange Format (GIF), online games (MegaWars III, Island of Kesmai), travel booking system (EaasySABRE)
Parent	H&R Block (1980–1997), AOL (1997–2002)

CompuServe, Inc. (also known as CompuServe Information Service, Inc. or CIS) was a trailblazing American company that delivered one of the earliest prominent commercial online platforms. Established in 1969 as a timesharing and remote access provider for corporate clients, it expanded its reach to the general public in 1979 by leasing unused after-hours capacity to customers of Radio Shack.

In 1980, H&R Block purchased CompuServe, which then vigorously promoted its offerings and secured a leading position within the online service sector throughout the 1980s, including the acquisition of rival The Source. The company gained recognition for its file-sharing capabilities—particularly for images—and hosted some of the first online content such as the 1985 comic Witches and Stitches. CompuServe developed the RLE image format and subsequently introduced the Graphics Interchange Format (GIF), created by Steve Wilhite, which emerged as a dominant format for 8-bit images on the Internet during the early 1990s.

During its prime in the early 1990s, CompuServe provided an online chat platform (CB Simulator), a wide range of message boards, vast software archives, and popular multiplayer games like MegaWars III and Island of Kesmai. By 1994, it was considered one of the "Big Three" information services alongside Prodigy and America Online (AOL). Nonetheless, CompuServe’s market presence diminished with AOL’s growth and the expansion of the open World Wide Web.

In 1997, following a complex deal orchestrated by WorldCom, CompuServe was acquired by AOL. The introduction of new products under the CompuServe brand ceased by 2002, and the original service—later termed CompuServe Classic—was terminated in 2009 after operating for over thirty years.

Founding

CompuServe originated in 1969 as Compu-Serv Network, Inc., based in Columbus, Ohio, initially functioning as a division of Golden United Life Insurance. Its inaugural president was John R. Goltz, who was soon succeeded by Jeffrey Wilkins; both held degrees in electrical engineering from the University of Arizona. Early contributors included Sandy Trevor (developer of the CompuServe CB Simulator chat system), Doug Chinnock, and Larry Shelley.

The company’s mission was to provide internal computing services for Golden United Life Insurance while also building an independent enterprise in the computer time-sharing sector by leasing access to its PDP-10 midrange computer systems to external businesses. By 1975, it had become a standalone entity publicly traded on the NASDAQ under the ticker CMPU.

Changes in leadership redirected CompuServe’s focus from pure time-sharing to delivering application software solutions. Important executives brought on board included Robert Tillson (Executive VP of Marketing), Charles McCall (later CEO and former head of HBO & Co.), Maury Cox (who succeeded McCall as CEO), and Robert Massey (who followed Cox).

In 1977, the firm adopted the name CompuServe Incorporated. By 1979, it had introduced a dial-up online information service aimed at consumers. In May 1980, with fewer than 1,000 subscribers at that time, H&R Block acquired CompuServe for $25 million; subscriber numbers surged to roughly 110,000 within four years.

Technology

CompuServe's initial dial-up system, established in 1969, linked local telephone lines through a time-division multiplexer to leased lines connected with time-sharing host computers. At first, each phone number corresponded to a single host, requiring users to call different numbers to access various machines.

Subsequently, the original central multiplexers were substituted with PDP-8 minicomputers connected to a DEC PDP-15 switch, which enabled more flexible routing of phone numbers. By 1977, CompuServe had created its own packet-switching network utilizing DEC PDP-11 minicomputers as nodes distributed throughout the United States and internationally. This infrastructure later advanced into a layered system incorporating technologies such as Asynchronous Transfer Mode (ATM), Frame Relay (FR), Internet Protocol (IP), and X.25.

In 1981, The Times described CompuServe’s technology as a video-text-like platform that allowed personal computers to download software via telephone lines. Meanwhile, The New York Times recognized CompuServe as "the most international of the Big Three," noting its accessibility through local calls in more than 700 cities.

Besides consumer offerings, CompuServe managed a Financial Services division that consolidated data from sources including CompuStat and major stock exchanges. This division developed screening and reporting tools extensively utilized by investment banks on Wall Street.

CIS

In 1979, Radio Shack introduced MicroNET, a residential information service that utilized CompuServe’s unused computer capacity during evening hours. Its popularity prompted CompuServe to rename MicroNET as CompuServe Information Service (CIS), establishing a significant consumer-focused enterprise alongside competitors like The Source (which CompuServe eventually acquired and disbanded in 1989).

By the mid-1980s, CompuServe had become a dominant provider of information and networking services with commercial offices in over 30 U.S. cities, primarily marketing network services to businesses. Consumer subscriptions—offered through computer retailers with trial login options—gained widespread recognition and accounted for half of the company’s revenue by 1987.

CompuServe cultivated an entrepreneurial environment that encouraged experimental projects. Notably, Alexander "Sandy" Trevor created the CB Simulator chat system over a weekend, which grew into one of CIS’s most favored features. Rather than internal oversight, forums were managed by contracted systems operators (sysops) who earned compensation based on their boards’ performance, enabling scalable community management.

Newspapers

Starting in July 1980, CompuServe began providing text-based versions of major newspapers such as the Columbus Dispatch, The New York Times, and The Washington Post. By 1981, this offering extended to titles including the San Francisco Chronicle and Los Angeles Times. Although newspaper content accounted for approximately 5% of CompuServe’s overall traffic, downloading entire editions was impractical due to lengthy transfer times and substantial hourly fees.

Selling connectivity

In 1982, CompuServe introduced CompuServe Network Services (CNS) to commercialize its nationwide packet network built on proprietary technology featuring custom network processors derived from the DEC PDP-11 architecture. CNS incorporated Adaptive Routing capabilities that allowed automatic detection of new switches and dynamic traffic distribution based on current network conditions, thereby improving reliability and operational efficiency.

While not a pure X.25 network, CNS offered customers a standard X.25 interface that facilitated collaborations with private networks such as Tymnet and Telenet. This enabled CompuServe to provide the broadest global range of dial-up connections during an era when usage fees were high but still less expensive than traditional long-distance charges. Users in the early 1980s often faced connect-time fees that led to nicknames like CompuSpend and Compu$erve.

Over two decades, CNS became a leading dial-up communications provider for credit-card authorization transactions through a key partnership with Visa International. At its height, millions of authorization requests were processed monthly via CompuServe's network, representing billions in consumer spending. This dial-up service continues under Verizon’s operation today without significant competition in this specialized market.

As an early innovator in online services for personal computers, CompuServe launched commercial e-mail and technical support through InfoPlex in 1978 and introduced the first public multi-user chat program, CB Simulator, in 1980. In 1985, it unveiled EaasySABRE, which enabled consumers to book flights and accommodations directly without travel agents. Additionally, the company developed various online games that enriched its diverse product lineup.

File transfers

In approximately 1981, CompuServe launched its proprietary file-transfer protocol known as CompuServe B protocol, which enabled users to exchange files. This protocol was later enhanced into the more efficient B+ version, primarily utilized for downloading content from CIS. Although third-party adoption of B+ was limited, it served as the default protocol for CIS and eventually incorporated the Host-Micro Interface (HMI). The HMI facilitated communication between client applications and mainframe servers, providing a graphical user interface as an alternative to the traditional command-line environment.

CompuServe's international expansion began in 1986 with partnerships involving Fujitsu and Nissho Iwai in Japan, culminating in the launch of the Japanese-language service NIFTY-Serve by 1989. The company established CompuServe Hong Kong in 1993 through a joint venture with Hutchison Telecom, amassing a customer base of 50,000 prior to the surge of dial-up ISPs. Between 1994 and 1995, Fujitsu collaborated with CompuServe to develop WorldsAway, an interactive virtual community; its original Dreamscape chat feature remained operational as late as 2014.

During the late 1980s, CompuServe provided access through global X.25 packet-switching networks and subsequently introduced direct dial-up access points in numerous countries to reduce expenses. This infrastructure growth supported offices in London and Munich and expanded CompuServe’s worldwide presence.

CCAC

Together with attorney Randy May, CompuServe successfully petitioned the Federal Communications Commission (FCC) to exempt data networks from common carrier access charges (CCAC) imposed by local telephone companies on long-distance calls. This regulatory decision lowered dial-up networking costs across the United States and fostered growth within emerging data-driven industries by detaching them from conventional voice telephone pricing structures.

Internet

CompuServe pioneered limited Internet connectivity in 1989 by integrating its proprietary e-mail system with Internet-based addresses. In the early 1990s, it hosted hundreds of thousands of users engaging in thousands of moderated forums—precursors to contemporary discussion platforms—thereby expanding its audience beyond corporate clients to include technical enthusiasts.

Certain premium forums and databases implemented fees based on searches or entries. In 1992, CompuServe introduced WYSIWYG e-mail composition and forum posting through the third-party NavCIS application, enabling offline message editing and interactive browsing on DOS and Windows systems.

To rival AOL’s offerings, CompuServe developed the CompuServe Information Manager (CIM), a point-and-click interface leveraging the HMI protocol for online activities combined with offline message caching. This improved user experience while managing connection expenses effectively.

Account holders could purchase services and software from other members before widespread commercial Internet availability. By the early 1990s, hourly usage fees had decreased from over $10 to $1.95. In March 1992, online account registration with credit card payments was introduced alongside a desktop email management tool.

By April 1995, CompuServe had grown to more than three million subscribers—the largest online service provider at that time—and launched NetLauncher to offer World Wide Web access using a Mosaic browser. Nonetheless, AOL’s flat-rate, advertising-supported pricing model rapidly diminished CompuServe’s market share until it adopted a similar $24.95 monthly fee structure in late 1997.

As web usage surged, many businesses shifted their customer support from CompuServe forums to their own websites due to CompuServe’s then-limited Web access capabilities.

In 1992, CompuServe acquired MicroSolutions, a company owned by Mark Cuban, for $6 million—a strategic move that strengthened its business offerings.

AOL’s entrance into the PC market in 1991 intensified competition by offering lower hourly rates and a free graphical client, challenging CompuServe’s paid client approach. By late 1994, CompuServe provided unlimited standard services for $8.95 per month but continued charging per external e-mail message.

User numbers peaked globally at three million in April 1995; however, AOL’s U.S. subscriber count surpassed 20 million at that time. By 1997, many users were transitioning from traditional online services to dial-up Internet service providers.

Beginning in 1997, CompuServe migrated its forums from the proprietary HMI protocol to HTML web standards, phasing out text-based access but maintaining both web and HMI interfaces until fully switching to web-only access in 2004. The forums remained active until their closure at the end of 2017.

Acquisitions

CompuServe completed multiple acquisitions both prior to and following its acquisition by H&R Block:

Early 1970s – Alpha Systems, a Dallas-based regional timesharing firm utilizing PDP-10 technology. The PDP-10 system from Alpha Systems was subsequently incorporated into CompuServe’s Columbus data center.
Circa 1986 – Software House, known for developing System 1022, a relational database platform.
Circa 1986 – Collier-Jackson, a company specializing in human resource management software solutions.
1988 – Access Technology, the creator of the 20/20 spreadsheet application.
1995 – Spry, Inc., the originator of Internet in a Box, recognized as the first consumer-oriented internet suite.

User IDs and e-mail addresses

Initially, CompuServe user IDs consisted of seven octal digits (7xxxx,xx), reflecting the underlying PDP-10 system architecture, before expanding to ten-digit formats (1xxxxx,xxxx). Beginning in 1989, internet email access was provided through IDs formatted as xxxxx.xxxx@compuserve.com. By 1996, users gained the ability to set up email aliases and personal web pages; POP3 access was introduced in 1998 to enable compatibility with a wider range of email clients. Presently, addresses under CompuServe 2000 appear as XXXXXX@cs.com.

Custom portals

To broaden its market appeal, CompuServe created industry-specific portals tailored to various professional sectors. Since the 1970s, it offered a specialized service for airlines allowing pilots and flight attendants to bid on schedules. Other customized offerings included "CompuServe for Lawyers" and the "African-American Culture and Arts Forum." A two-year collaboration with WebMD under CompuServe 2000 delivered a dedicated health information portal.

CompuServe GUIs

Multiple graphical user interfaces were developed to facilitate access to CompuServe services, including WinCIM, TapCIS, and NavCIS. Unlike AOL’s free software options, these interfaces were commercial products designed to optimize user productivity on a timed-access platform where customers paid for online duration and long-distance charges in certain areas.

TapCIS

TapCIS (The Access Program for the CompuServe Information Service) was an automated MS-DOS-based application that streamlined management of CompuServe email and discussion forums from 1981 through 2004. Although its interface appeared outdated by modern standards, it remained an effective tool for forum participation.

Created using Borland Turbo Pascal by Howard Benner—a marketing executive and founder figure from Wilmington, Delaware—TapCIS was distributed as shareware at a nominal fee. It cultivated a dedicated user base that maintained its own website. Its capacity to perform administrative commands made it especially popular among CompuServe system operators (sysops), highlighting its importance in community management.

CIM and WinCIM

WinCIM and its predecessor CIM offered broader navigation capabilities across CompuServe’s services but did not necessarily reduce expenses or improve time efficiency compared to TapCIS, according to PC Magazine. These graphical interfaces provided a more extensive overview of available products and services but lacked the operational efficiency preferred by frequent users.

OzCIS and OzWIN

OzCIS, along with its Windows-based successor OzWIN, was characterized by PC Magazine as "free for personal use," yet functioned as shareware priced at $65, aligning with the cost structure of WinCIM, TapCIS, and NavCIS. Created by Steve Sneed utilizing Delphi programming language resembling Pascal and distributed by Ozarks West Software Inc., these applications offered system operator utilities including message handling, file library management, and user flagging capabilities. Unlike many offline readers that employed proprietary text formatting, OzWIN preserved plain text without incorporating any specialized styles. CompuServe terminated access to the OzCIS and TapCIS discussion forums in May 2005.

AutoSIG

AutoSIG (executed as ATOSIG.EXE on CompuServe) was provided at no cost, setting it apart from other commercial clients such as WinCIM, TapCIS, NavCIS, and OzCIS/OzWIN.

VisCIS

Visual CompuServe (VisCIS) was a conceptual client developed by John D. Gwinner based on VRML technology that converted the CompuServe interface into a three-dimensional virtual space. Gwinner subsequently advanced this idea into VisMenu, a versatile VRML-based menu system.

FILe Generator and Editor (FILGE)

FILGE represented an early 1970s command-driven text editor used by CompuServe before being superseded by screen-oriented WYSIWYG editors. It operated through forward slash (/) commands for text editing tasks, allowing users to execute sophisticated file modifications without writing code. For instance, to substitute "fox" with "wolf" in a sentence, the following command was used:

/c/fox/wolf

and the changes could be previewed via:

/p

This utility provided comprehensive file editing functions essential for early electronic communication processes.

Market share

By 1987, CompuServe dominated the online service provider landscape with 380,000 subscribers, outpacing rivals such as Dow Jones News/Retrieval (320,000), The Source (80,000), and GEnie (70,000). At its height, CompuServe boasted three million users globally, whereas AOL reached 27 million. However, with the rise of standard dial-up Internet access by early 1999, CompuServe’s subscriber count declined to two million, primarily consisting of business and professional clientele.

Legal cases

In 1991, CompuServe was involved in a defamation lawsuit titled Cubby v. CompuServe, which became one of the first legal challenges concerning internet liability. The court ruled that CompuServe was not liable for defamatory content posted in forums due to its lack of editorial oversight.

A copyright infringement case filed in 1993 involving approximately 900 songs concluded in 1995 with settlements paid to music publishers.

In 1995, following pressure from Bavarian prosecutors, CompuServe restricted access to sexually explicit newsgroups. When these newsgroups were reinstated in 1997, Felix Somm—then managing director of CompuServe Germany—was prosecuted for violating German child pornography legislation based on content transmitted through these feeds. He was convicted in 1997 and sentenced to probation in 1998 but was ultimately acquitted on appeal in 1999.

WOW! service

WOW! (stylized as WOW!) was an unlimited flat-rate online service introduced by CompuServe in March 1996; however, its shutdown was declared by November of the same year, becoming effective January 1997.

Multiple class-action lawsuits alleged that WOW! had been marketed to shareholders under deceptive pretenses. Created to rival AOL, WOW! targeted families and beginners as a proprietary platform. Announced in late 1995 to coincide with the release of Microsoft Windows 95 SR2—which integrated Internet Explorer—Microsoft intended to include installers for leading ISPs within Windows itself; however, CompuServe’s software failed to be ready for this launch.

Wow.com domain

Following its acquisition of CompuServe, AOL maintained ownership of the wow.com domain but left it inactive until 2007. Initially, AOL contemplated relocating its Digg-style news aggregator from Netscape.com to wow.com; however, the project was eventually launched on Propeller.com. Later that same year, AOL considered utilizing wow.com as a platform for a social networking service connected to the widely popular game World of Warcraft.

Between 2010 and its closure in 2015, some content was transferred to a Joystiq subdomain. Concurrently, wow.com briefly operated as a daily deals website akin to Groupon, before ceasing operations in late 2011.

As of January 2019, wow.com serves as a search engine powered by Bing, sharing backend infrastructure with AOL Search under the management of Oath Inc..

AOL acquisition and post–1997 history

The rivalry between AOL and CompuServe escalated, with customers often switching services by taking advantage of free usage hours and promotional offers. Technical difficulties emerged as newly introduced U.S. Robotics dial-up modems frequently failed under heavy call traffic, resulting in CompuServe experiencing significant financial losses for the first time in many years. To address these challenges, the "Red-Dog" initiative was launched to migrate CompuServe’s aging PDP-10 systems to Intel x86 servers operating on Windows NT.

Meanwhile, H&R Block, CompuServe’s parent company, underwent leadership changes including the retirement of CEO Henry Bloch. In 1997, H&R Block announced intentions to divest CompuServe. Although various proposals were received—including stock-based offers from AOL—H&R Block preferred cash payments or higher-quality stock options.

In February 1998, John W. Sidgmore, vice chairman of WorldCom, orchestrated a deal in which WorldCom acquired CompuServe for $1.2 billion in WCOM stock. The following day, WorldCom sold the CompuServe Information Service division to AOL but retained ownership of CompuServe Network Services. Meanwhile, AOL transferred its Advanced Network Services (ANS) unit to WorldCom. Sidgmore described this arrangement as aligning each entity with its core focus: accountants with tax services, AOL with information services, and WorldCom with network infrastructure.

WorldCom rebranded its acquisition as WorldCom Advanced Networks and integrated it with AOL’s ANS division and WorldCom’s Gridnet subsidiary. After acquiring MCI in 1999 and becoming MCI WorldCom, the network services business was consolidated into UUNET. Following financial difficulties and bankruptcy proceedings, WorldCom reemerged under the MCI name.

In 2001, CompuServe released version 7.0 of its service. By September 2003, operating as an AOL division, CompuServe Information Service expanded its portfolio by introducing CompuServe Basic through Netscape.com.

2006–present

MCI was sold to Verizon in 2006, incorporating the former CompuServe networking assets into Verizon Business.

In January 2007, CompuServe informed users that Windows Vista was no longer supported and encouraged migration to AOL-branded services; however, the CompuServe client software remained functional via compatibility mode.

To oversee the CompuServe brand, a jointly held holding company was established to manage trademarks and intellectual property rights, licensing them royalty-free to both WorldCom (now Verizon) and AOL.

CompuServe Information Services (CIS) catered to several million subscribers within AOL's Web Products Group. The U.S. CompuServe client software utilized the Gecko engine embedded within an AOL client operating on the AOL dial-up network. The traditional service known as "CompuServe Classic" continued operating in the U.S. and other regions without incorporating CompuServe 2000 features.

On April 15, 2009, CompuServe announced it would discontinue CompuServe Classic as an Internet Service Provider effective June 30, 2009. This shutdown included termination of all Classic services such as OurWorld Web pages; however, email users retained their addresses through a new system.

Following Verizon’s acquisition of AOL in 2015, all original CompuServe assets became part of Verizon’s holdings.

In November 2017, CompuServe declared it would close its Forums by December 15, ending one of its final active community platforms.

AOL continued utilizing the CompuServe brand for CompuServe 2000—a low-cost service discontinued in 2011—and for CompuServe Dialer, a dial-up ISP that evolved into a Web portal.

As of 2024, Compuserve.com operates as a rebranded iteration of the Netscape Internet Service Web portal.

International operations

Prior to the widespread adoption of the Internet and World Wide Web, CompuServe UK's subsidiary pioneered one of the United Kingdom's earliest major-brand online shopping platforms within its exclusive consumer services. In the late 1980s, Andrew Gray oversaw CompuServe UK's European activities, later advancing to European general manager, while David Gilroy held the position of UK director of customer services. Suzanne Gautier and Colin Campbell were responsible for technical support and sales management, respectively.

The initiative originated from Paul Stanfield, an e-commerce consultant, who presented the concept to Martin Turner, Product Marketing Director at CIS UK, in August 1994. Following Turner's endorsement, the project launched in September, quickly conducting market research and securing online retail space for prominent UK brands such as WH Smith, Tesco, Virgin/Our Price, GUS, Interflora, Dixons Retail, Past Times, PC World (retailer), and Innovations.

Officially debuting on April 27, 1995, the service was highlighted by Stanfield’s purchase of a book from WH Smith—replicating a successful February trial that incorporated secure payment processing and delivery via Royal Mail. The Interactive Media in Retail Group (IMRG) acknowledges this transaction as the United Kingdom's inaugural secure online retail purchase. Initially, about one million UK consumers engaged with these digital storefronts, offering British retailers their first meaningful exposure to e-commerce. Soon after, additional retailers including Sainsbury's Wine and Jaguar Cars joined the platform. To bolster this expansion, CompuServe UK provided promotional materials such as a 'UK CompuServe Book' and a complimentary CD-ROM containing access software.

Although initially successful, CompuServe’s closed network approach fell behind the swiftly evolving open World Wide Web model, leading major UK retailers to launch their own independent websites.

In Germany, CompuServe 2000 was introduced in 1999 but discontinued by 2001 due to insufficient market traction; nonetheless, the CompuServe Classic service persisted temporarily. The German branch offered dial-up and DSL internet connections alongside proprietary client software named CompuServe 4.5 light.

CompuServe Pacific announced its closure in July 2007, effective August 31 of that year. Shortly thereafter, CompuServe France terminated services on November 30, 2007. The CompuServe Pacific franchise in that region was operated by Fujitsu Australia. In July 2008, customers in Germany were informed that operations would cease on July 31, 2008; however, its longstanding "CompuServe Classic" service remained operational.

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