 The first systems shipped to beta customers in 1985 was FDOS version 1.6 with 1.8 released in 1986 and 2.2 in 1987.This included a limited workflow scripting system which was rewritten and expanded in the late 1980s for Windows.In the early 1990s, FileNet introduced a more "open" version of its WorkFlo Business System software, the Series 6500, that ran on the IBM RS/6000 AIX system.