Issue with Gmail IMAP Error 78754 in Microsoft Outlook

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Outlook client is throwing up the “IMAP Error 78754“.

The IMAP is mainly used by Outlook to retrieve the Gmail messages from mail exchange servers. So, if the Outlook client is throwing up the “IMAP Error 78754“, receiving email updates may be stopped.

If the IMAP is disabled in the Outlook app, this situation may arise.

Resolution: Enable the IMAP protocol from the Google Account settings on the device.

Follow these these below steps,

  1. Open a browser and load the Gmail settings console
  2. Log into the account if it is needed
  3. On the right-top corner, tap the “settings button” to access the settings
  4. Next, tap “See all settings” to access that. This will open the entire Gmail settings in the browser
  5. Go to the “Forwarding and POP/IMAP” settings tab
  6. There should be IMAP access section. Choose the “Enable IMAP” option
  7. There should be other IMAP settings as well. Go through these settings and enable those IMAP feature as need-to-be basis
  8. Once you have tweaked it, tap “Save changes“
  9. Gmail page should reload
  10. Close the browser and relaunch the MS Outlook. Check if you are still getting the “IMAP Error 78754” error code in Outlook.

This IMAP feature may not work properly if 2-FA or two factor authentication is used to secure the account. As Google has recently cut off the support for the access of the less secure apps, there is not much to perform. (Refer the suggested two factor authentication link.)