I have 10.9.1 with all updates installed and for me Mail.app is still broken in many ways with Gmail. The most annoying is the failure for messages deleted in iOS to delete on Mail.app. Moreover, messages read in iOS do not show as read (or moved to a different folder/tag) on OS X. Is anyone else still experiencing issues with Mail.app? I am so tired of waiting for simple functionality to be fixed. I don't care to hear "it is Google's fault"... only interested in seeing if other folks are still impacted or if it is just me* *I use Google Apps now, but up until a few weeks ago was using Gmail and was impacted in the same way.