The Faulty update rollup 8 for Exchange 2010 SP3 has been re-released in a corrected version. I was no longer able to reproduce the errors in my test environment. But if you want to be on the safe side, it's better to wait a few more days. Click here to download:
http://www.microsoft.com/de-DE/download/details.aspx?id=45225
Here is a list of the corrected problems: