This is probably a stupid question, and I know I can research this, but I was hoping I could get an answer from someone who is using both methods of message handling. What is the difference between archiving email in Exchange 2010 through the use of a managed custom folder and a retention policy? They both seem to do the same thing, and I've not used either, so I must be missing something. Can someone give me examples of why one would be used over the other, etc.?