Using Crossover 7.0.2 under Ubuntu 8.04. Installed Cisco Unified Personal Communicator 7.0(1) into fresh winxp bottle. De-selected Outlook Add-in ('cause Outlook isn't installed anyway!). Installation appeared to complete successfully.
Two applications were installed:
Cisco Unified Personal Communicator, which does appears to do nothing when run.
Create Problem Report, which creates a ZIP archive containing some very basic system configuration information and stores it in c:\windows\profiles\crossover\Desktop.
Conclusion: Failure.