Were you aware that EMC no longer displays a warning at the top of the work pane when an error is encountered? This used to be a tell-tale sign that some attributes such as illegal characters in the exchange alias existed or that the UPN suffix needed fixing. Great, EMC looks more clean - but you're actually making more work for us. And when I do open the properties of a mailbox that has some problem with some value, I get a warning box stating that invalid data exists, but it doesn't tell me where. I'm having to hunt down the issues. It's not progress, it's one step forward and two steps back.
Thankfully when I apply the email address policy, the output includes more detail so I'm able to track back to fix the issues.