You can grab it from here
Microsoft Office Communicator Mobile (2007 Release) extends the reach of Office Communications Server 2007 to information workers who use Windows Mobile powered devices. Communicator Mobile provides presence and communication features that are similar to the desktop version of Microsoft Office Communicator 2007 when users are away from their desks.
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There's quite a lot of stuff about Communicator Mobile out there as Solsie , Paul and Brett have noticed,