Windows Messenger 5.1 Support when Upgrading LCS 2005

A quick post for anyone upgrading from LCS 2005 to OCS 2007. The first step in upgrading your LCS 2005 infrastructure to OCS 2007 is to replace the perimeter (e.g. replace your LCS Access Proxies with OCS 2007 Edge Access Servers). This will result in a mixed environment: OCS 2007 on the Edge and LCS 2005 SP1 internally.

In this situation, Windows Messenger 5.1 and Microsoft Office Communicator Mobile 1.0 clients will not be able to log on to LCS 2005 through the OCS 2007 Edge.

For more details, see Microsoft Knowledge Base Article 94957 (http://support.microsoft.com/kb/949574/en-us).

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