CFEXCHANGETASK UID Format

When using the CFEXCHANGETASK tag to create a Task in Exchange, a UID is returned.  In Exchange 2010, the format is like this, which is Exchange Web Services (EWS) format:

AAMkAGMwODNlNWZkLWM2NWQtNDJjMS04ZThiLTk5MTA1YzI1ODZmYgBGAAAAAADPyj6cVxiBQKuRB7Ygt4sEBwBplZyf6cGiTIbMibBUW679AAAAAAETAABplZyf6cGiTIbMibBUW679AAB3C9DBAAA

When working with Exchange 2007, the UID format is like this:

AQEAAAZhJ4amAAAAAAAAAAAAAAAA

I cannot determine what that format is, and I don't have direct access to the Exchange server to do some sort of internal search of the Exchange store.

Does anyone have experience with understanding exactly what this is?