Solution by Event Log Doctor

This Error event is logged when a Volume Shadow Copy Service (VSS) copy operation is stopped. See the additional links for more information. In this case the event source on Exchange 2010 is not properly registered, and as such the event is not displayed correctly.

http://www.microsoft.com/technet/support/ee/transform.aspx?ProdName=Exchange&ProdVer=6.5.7596.0&EvtID=2007&EvtSrc=ESE&LCID=1033