Mavericks breaks Mailbox and Apple Mail compatibility?
It seems that Apple Mail on OS X 10.9 no longer behaves so that your inbox on the popular app Mailbox updates your Gmail mailboxes on your desktop. I'm definitely not an expert. All I know is that emails that I've snoozed or dismissed on my iPhone and iPad are still in my inbox on Mavericks.
Between that and Pages loosing tons of features, I'm a little bummed!