This knowledgebase article lists the recommended OS/database combinations on which you can install RoboHelp Server 9. Adobe recommends that you don't install RoboHelp Server 9 on combinations marked with X in the table below.

Operating System OS bits DB bits Oracle Microsoft Access Microsoft SQL Server Express Edition Microsoft SQL Server
Windows Server 2003 64 64 Yes Yes Yes Yes
Windows Server 2008 SP2 64 64 Yes X X X
Windows Server 2008 R2 64 64 Yes Yes X X
Windows 7 64 64 Yes X Yes Yes
Windows XP SP3 64 64 Yes Yes Yes Yes
Windows Server 2003 SP2 32 32 Yes Yes Yes Yes
Windows Server 2008 SP2 32 32 Yes Yes Yes Yes
Windows 7 64 32 Yes Yes X X
Windows XP SP3 32 32 Yes Yes Yes Yes