I use MAIL on my MBP and I only upgraded to Maverick 2 days ago and all was fine. This morning, I started noticing some weird things in my Mail program. If i opened up an email, once closed I couldn't find it again or at least easily and now looking down the sides to all my IMAP folders for Gmail accounts, most of the folders are all missing......and then under the main folders at the top I s suddenly have an Archived folder that wasn't there before but it seems to be archiving all my Sent mail, so I now have 2 folders of sent mail So far i haven't lost any emails as i am double checking on another Mac I run that isn't on Maverick yet I don't really imagine that there is a solution to this yet but wondering if it is happening to others with Gmail accounts using Mail? If so, and i know its not just me, than I will sit and wait for some sort of update to fix it. On the other hand IF THIS IS THE NEW MAIL and I have missed something about it i don't like it So just curious at this point to know if others with gmail are having the same issues?