The 'Services' string type value located in 'HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\%EXREG%\Setup\Services' registry key is ...

The 'Services' string type value located in 'HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\%EXREG%\Setup\Services' registry key is missing or inaccessible. The Microsoft Exchange Information Store service won't start. As a result, all services that depend on this service won't be able to start. For more information, see http://support.microsoft.com/kb/285116.