Yes, as a matter of fact I prefer to use Thunderbird to access my Zimbra account via IMAP and use the Zimbra Desktop Client or Zimbra Web interface for the Calendar feature and to keep myself familiar with Zimbra to be able to support my clients who use Zimbra.
BTW, Thunderbird was showing zero messages in the Drafts folder but once I told Thunderbird to compact the folder, Zimbra immediately synced and shows zero messages there too.
Thanks for a FAST and CORRECT response.
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Bill Arlofski
Reverse Polarity, LLC