Seems like MS expired the API a little earlier than they promised - "As a result, the grace period will begin expiring in September 2009, 18 months after Windows Vista SP1 was released on the Microsoft Download Center in March 2008."
Not quite September yet! I first noticed this on an early build of Windows 7 and our SEP client.
We plan on fixing it in our MR5 client, which will RTM in September (I believe its actually fixed in the code now, I just need to get a later build to test)."
PLEASE UPGRADE TO RU5. The issue is resolved in this release.