Currently you shouldn't install any Exchange 2010 Update Rollup past UR3.
Update Rollup 4 and 4v.2 both break content indexing.
Update Rollup 5 broke DAGs and Microsoft has since stopped offering it for download.
These issues are supposed to be fixed in the upcoming Update Rollup 6, but we'll have to wait and see. Considering the obvious lack of QA testing Microsoft did on UR4, 4v.2, and 5 I'm going to hold off installing UR6 when it comes out to make sure it doesn't come with a bug as well.
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