PowerPivot for Excel 2010 November CTP Expired
If you are running the November 2009 CTP version of the PowerPivot for Excel 2010 add-in, your add-in expired on April 1st. We apologize for any inconvenience this may have caused you.
The SQL Server team will re-release the November 2009 CTP version of the PowerPivot for Excel 2010 add-in with an extended expiration date very soon. We will post an availability announcement with the download location and installation instructions on the PowerPivot blogs and forums as soon as possible.