Encrypted Database Not Supported
The IM and Presence Service does not support an encrypted database with Microsoft SQL Server, except in the following cases:
The IM and Presence Service supports an encrypted compliance database for the Message Archiver feature. For 11.5(x) releases, this feature is supported as of 11.5(1)SU5. This feature is not supported for 12.0(x), but is supported for 12.5(1).