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 |
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