Computer Associates acquired Information Unlimited Software in 1983 and ran it as an independent business unit. Easy Business Systems added payroll processing in 1984 and supported multiuser networking at this time. In 1987, it implemented a multi-window interface to allow moving between different modules. Easy Business Systems was renamed Accpac Plus in 1987 with the release of version 5. Accpac Accounting became popular in Canada with the support of Canadian public accounting firms that would sell and support the software. The name Accpac is an acronym for 'A Complete and Comprehensive Program for Accounting Control'.
[Source: Wikipedia]