I have been having Mavericks Mail.app & Gmail sync problems, like many of you, since shortly after upgrading to Mavericks.
I have 1 Gmail account, plus 2 custom domain Google Apps email accounts.
All accounts connect properly via Connection Doctor in Mail.app, and can send/receive etc. properly.
And all apps do NOT sync mail read/unread status and archived status with both Gmail web interface and iOS mail. iOS accounts sync perfectly with Gmail web.
When I updated to 10.9.2 everything synced properly for a few days, and then it broke again, reverting to the aforementioned pattern.
The only way to get a one-time sync fix was to quit Mail.app and re-launch it.
THIS "BANDAID FIX" JUST WORKED FOR ME:
- Quit Mail.app
- Launch System Preferences > Spotlight
- Uncheck "Mail & Messages"
- Launch Mail.app
Now (immediately after making that change), for the first time, all my Mavericks Mail.app gmails are syncing perfectly when modified on Gmail web, and on iOS Mail.
Obviously, this has a spotlight search implication, as that functionality is now disabled.
It may have other mail functionality impications that I'm not aware of yet (like searching within Mail.app?).
Has anyone else tried this bandaid solution yet with any reports of enduring success in functionality?