Outlook 2016 / 365: POP3 Duplicates After Installing February 16 Update


After applying the February 16 update for Office 365, version 16.0.6568.2025, you may encounter the following issues in Outlook 2016 when you are using a POP3 account.

  • When you have the POP3 account configured to leave the emails on the mail server for x days, the setting isn’t being respected and all emails are deleted from the mail server anyway.
  • When you have the POP3 account configured to leave all the emails on the mail server, the emails are repeatedly being downloaded and thus cause duplicates.

Outlook Issues | blog.media-moon.com

Microsoft is working on a fix but in the meantime, you can use one of the following workarounds.

  • Configure your POP3 account not to delete it after X days but leave a copy on the mail server (in some cases, you’ll then end up getting the second issue).
  • Configure your POP3 account to not keep a copy on the mail server.
  • Configure your account as an IMAP account instead of a POP3 account.
  • Uninstall the update by rolling back to version 16.0.6366.2068 or even earlier.

Uninstalling the update

Before uninstalling the update, disable automatic update via:
File-> Office Account-> Update Options-> Disable Updates

Additionally, create a reminder in your Calendar to re-enable updates in April as a fix for this issue should be deployed by then.

To uninstall the update and revert to the February 9 build, open a Command Prompt as an Administrator and run the following command:

"C:\Program Files\Common Files\microsoft shared\ClickToRun\OfficeC2RClient.exe" /update user updatetoversion=16.0.6366.2068

If you get an error when trying to revert to this build, revert to the January 25 build instead:

"C:\Program Files\Common Files\microsoft shared\ClickToRun\OfficeC2RClient.exe" /update user updatetoversion=16.0.6366.2062


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