On a weekend about a year ago I decided it was time to do some updates on our 2003R2 domain controllers. One of them, after the updates, failed to boot. (un)Luckily I had created a snapshot before I did the updates, so I just rolled back to the last snapshot and everything was('nt) back to normal. Not long after I reverted and booted up I started noticing all kinds of authentication and replication errors. As it turns out using snapshots on Server 2003R2 is a horrible idea and gets the USN all out of whack. I don't remember the exact steps I took to fix the issue, but it was certainly a few hours more than I wanted to spend on my weekend. I am very glad to be on Server 2012R2 and don't have to worry about USN rollback issues any more!
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