If you are getting an error like:
Error: Script failed (code "ERROR_NEED_MAJOR_UPGRADE_USE_IMP_EXP") when installing "CentralMgmtStore" on ...
When installing Lync 2010, try dropping the "xds" table from your database and letting it cleanly install:
C:\>sqlcmd -S.\RTC
1> DROP DATABASE xds
2> GO
1> QUITSymptom: When you go and view your SharePoint 2010 page (I received this error after a brand new installation), you receive:
HTTP/1.1 200 OK
Server: Microsoft-IIS/7.5
Date: Mon, 21 May 2012 21:59:32 GMT
Connection: close
Resolution: Try creating a new site collection:
Central Administration -> Application Management -> Create site collections
