Office Communicator Hotfixes

Microsoft Office Communicator hotfixes are not part of Windows Update, so it is important to find and deploy them through other means.

If you are upgrading to OCS 2005 from LCS 2005, and will have Office Communicator 2005 and 2007 clients coexisting, you should deploy Microsoft Office Communicator 2005 Hotfix KB 945573 ( In addition to addressing some OC 2005 specific functionality, it addresses several communication issues between OC 2007 and 2005 clients. See the knowledge base article for details.

Office Communicator 2007 also has a recent hotfix ( which addresses several issues and provides a rollup of previously released hotfixes.

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