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We can get this error as the title of this post when you try running OcsLogger.exe. Resolution: 1) You can run Stop-csclslogging command in Lync Server Management Shell 2) Or just stop Lync Server Centralized Logging Service Agent from Services.msc

When we are about to publish topology, if MMC crashes then the probable reason  might be wrong AD preparation. For this first of all remove the configuration store  location and then publish the topology after selecting thee correct CMS     Remove-CsConfigurationStoreLocation

For this I found a very useful post and here is the link to follow: http://blog.schertz.name/2010/11/lync-and-exchange-um-integration/ and ofcourse the microsoft link is also very useful: http://technet.microsoft.com/en-us/library/bb803622(office.12).aspx