VSTS2010 crashes on opening the team explorer->My queries node

this does not repeat if MSN office communicator (2007 R2 version) is exited. the issue occurs only if MSN office communicator is up and running. (no issues reported by communicator though)

Any help in this regard?

Debug log:

Unable to cast COM object

of type 'CommunicatorAPI.MessengerClass' to interface type 'MessengerAPI.IMessenger2'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{....}' failed due to the following error: Error loading type library/DLL. (Exception from HRESULT: 0x80029C4A (TYPE_E_CANTLOADLIBRARY)).

Windows event log

EventType clr20r3, P1 devenv.exe, P2 10.0.30319.1, P3 4ba1fab3, P4 microsoft.teamfoundation.collaboration.microsoft, P5 10.0.0.0, P6 4c7d8ce4, P7 49, P8 0, P9 system.invalidcastexception, P10 NIL.