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

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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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