A mere 5 weeks after Update Rollup 6, Microsoft have released Update Rollup 7 for Exchange 2007 Sp1. The update fixes around 50 issues.

For more info on the update and to download it, see KB953469 

I would like to highlight the following:

“Note Certain Exchange Server 2007 managed code services may not start after you install this update rollup. This is true if the services cannot access the following Microsoft Web site:
http://crl.microsoft.com/pki/crl/products/CodeSigPCA.crl

For more information about how to resolve or to work around this issue, click the following article number to view the article in the Microsoft Knowledge Base:
944752 Exchange 2007 managed code services do not start after you install an update rollup for Exchange 2007”

I also strongly recommend reading the “Known Issues” section before applying this update.