Lion Mail Yahoo IMAP Sync Inconsistent

Observed behavior: Mail is syncing with Yahoo IMAP every five minutes, but when I delete or mark messages as read from the Yahoo website, iPhone or any other device, the Mail app will not reflect these changes even after the auto or manul sync. In order to force Mail to sync accurately, I have to take the account offline and then switch it back online. Then, Mail syncs correctly.
If I force the re-sync WITHOUT first taking the account offline, the sync is not accurate. Even if new messages appear in the mailbox, the other deleted and marked-read messages are not accurately reflected in the sync. Again, the only way to make it accurate is to take offline and bring back online. Of course, if I restart Mail, this also resolves the issue. Restarting Mail is the same thing as far as the Yahoo IMAP server is concerned.
This problem is easily reproducible. I have tried a number of remedies.
1. I deleted the original Yahoo IMAP account and added a new Yahoo IMAP account with a new name multiple times. No change.
2. I restarted my Mac to see if this helps. Other than the temporary effect of restarting Mail, this does not change a thing.
3. I have looked on the Yahoo site, and well... Here I am.
4. I also looked on Gmail site, almost more helpful.
5. Finally, I looked on the Apple Support Communities but cannot find an answer.
So, let's see if there are others having the same issue and maybe there is a solution somewhere.
Thank you.

This is definitely not Yahoo-specific, nor is it new.  Definitely seems to be a bug in Mail.app.  This has been happening at least since 10.5 (am now on 10.8.2), and I have a GoDaddy hosted IMAP account.
Same symptoms...I delete emails on my Mac in Mail.app.  I've gotten into the habit of forcing a manual sync.  The emails disappear from the Mac, but several minutes or sometimes many minutes later, if I look on my iPhone or iPad, the messages have not been deleted.  If I subsequently go look on my Mac, or at the server through a webmail browser - they're back.
However, if I delete the emails from my iPhone or iPad - they really do get deleted.
As stated up above - quitting and reopening Mail.app can force a real sync that gets things going back in sync...it seems like maybe Mail.app somehow forgets to actually sync...so when this starts happening - i.e. I notice deleted emails still appear on my iPad - if I quit mail and reopen it, it also shows the previously deleted email.  So the symptoms seem like there is a "cache" of actions (deletes) in Mail.app that is not getting processed to the server.  When you quit, this list seems to get flushed and whatever is causing Mail.app not to sync to the server gets remedied and on restart, the not-deleted emails show up because Mail.app now syncs with the server.  Occasionally it seems Mail.app somehow can come out of this without being restarted...I'm not sure if that happens when it's "kicked" by some other event, e.g. an incoming message, to sync.
Extremely annoying.

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