Sage MAS 90 and Windows 7
From a recent report from a Sage spokesperson:
Sage MAS 90 and 200 will support Windows 7, 32-bit with version 4.4, scheduled for release in early February 2010.
In addition, the intent is to support Windows 7 64-bit for 4.4 and both 32- and 64-bit for version 4.3 with Product Update 18, scheduled for release at the end of March, assuming successful completion of all test cases. Older versions will not be supported on Windows 7.