The 2007 R2 release of Microsoft Office Communicator Mobile is supported in an Office Communications Server 2007 R2 deployment. Previous 2007 releases of Office Communicator Mobile can be upgraded directly to Office Communicator Mobile 2007 R2.

For devices running the 2005 release of Communicator Mobile, you must first remove the 2005 release of Communicator Mobile and then install Office Communicator Mobile.

The procedure for installing Office Communicator Mobile includes the following: