Accpac has been purchased by Sage Software Group.
The Accpac Advantage Series is one of the first mid-market accounting applications to support deployment on both Linux servers and Linux desktops.
There is a US Sage Accpac ERP vendor pushing Accpac on Linux. They also have a NZ vendor who are aggressively pushing Accpac software on Linux. The technical support for the Windows version is done by KPMG. Also note, that the Windows version can run quite happily with 20-40 MB of RAM usage, so if being run with the use of thin clients can put a heavy load on a server. (Never mind it's SQL backend can also chew up a good 300+MB of RAM)