You cannot create multiple RMS Client sessions for one user context on a Windows Vista-based computer
Consider the following scenario:
- You have a computer that is running Windows Vista or Windows Server 2008.
- The computer has Rights Management Services (RMS) Client installed.
- On this computer, you try to create multiple RMS Client sessions for a single user context.
However, the operation is unsuccessful.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB950888.