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Office 365: Duplicate Items In Sent Folder

If an Office 365 mailbox is configured in a mail client via IMAP, there may be two copies of each sent message in the Sent Items folder. This is because the IMAP client is saving a copy in the folder, and Office 365 is saving a copy of messages sent via the SMTP server.

To prevent this on Thunderbird:

  1. Go to ToolsAccount Settings.

  2. Under the approproate account, click Copies & Folders.

  3. Untick Place a copy in:

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