Thunderbird IMAP Shared Folders Performance Problem

I have been struggling with my email shared folders for quite a while now. I always thought the problem is at the server end. After working with my email admin for a few days, we finally found that the problem is related to Thunderbird.

There is a feature called IDLE command support in Thunderbird. If I have this feature turned on, it’s very slow to access the IMAP shared folders. To turn it off, follow these steps.

  1. Click on Tools -> Account Settings.
  2. Click on the Server Settings of the affected account and click on Advanced… button.
  3. Uncheck the box Use IDLE command if the server supports it .

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