Can't connect to the backend DB during re-install of Public from Private

I'm having a great deal of difficultyconnecting to SQL 2005 sp1 during the running of the deployment tool on the FE.. The error message indicates that I have to install the Backward compatible tool on the FE... Did that and upgraded SQL to SP1... Still a no-workie..Exactly what SQLs are compatible with the Public version of OCS... It worked fine with the Private version and SQL2005...What is FE and OCS ?

Jens K. Suessmeyer.

http://www.sqlserver2005.de
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FE= front end server from the LCS or OCS

OCS=Office Communications Server