Update on this:
Just an update on this; word has it that there is a hotfix being tested right now and it should be released by the end of January 2011.
I may have found a bug in FIM 2010. I'm synchronizing usernames from my HR system all in uppercase, however one of my users have been previuosly created through the FIM portal with a lowercase username / accountname. Now when I export the uppercase username to FIM, I get an Export Statistic that says that it went okay. However, doing a confirming import, I get the lowercase username back resulting in an exported change not reimported error? I've doublechecked my rules for any function or similar that might affect this but didn't find any. And now I'm seing this with an email address that have been changed from mixed case to all lowercase.
Have anyone else tried this and got an 'exported-change-not-reimported'?
I'll try to go through my usual "inside" channels and report this possible error.