Outlook 2019 / Microsoft 365 - How to Reset Outlook Sync Connection

Outlook Sync can fall out of sync with EnGuard servers after Windows updates, Office updates or EnGuard system updates.

This guide shows you how to reset your Outlook Sync account in Outlook 2019 or Microsoft 365. The steps below remove the account from Outlook and add it back.

Part 1: Remove the account from Outlook

Step 1: Close Outlook

Close Outlook.

Step 2: Open Mail in the Windows Control Panel

Open the Windows Control Panel. In the drop-down at the top right, select View by: Large icons. Then click Mail.

Step 3: Open Email Accounts

Click Email Accounts...

Step 4: Add a data file

Click the Data Files tab, then click Add...

Step 5: Save the file

Select a folder to save the file to and click OK.

Step 6: Remove the account

Click the Email tab, select your email account and click Remove.

Part 2: Clean up in webmail

Step 7: Open EWS in webmail

In Webmail, go to Settings, then Connectivity, then open EWS.

Step 8: Delete the entry

Click Delete.

Step 9: Confirm

Click Delete again to confirm.

Step 10: Open Outlook (MAPI)

Open Outlook (MAPI).

Step 11: Delete the entry

Click Delete.

Step 12: Confirm

Click Delete again to confirm.

Part 3: Add the account again

Step 13: Create a new account

Click New.

Step 14: Enter your details

Fill in the following, then click Next.

A) Your name. Recipients see this on all outgoing messages.
B) Your email address
C) Your password, typed twice

Step 15: Finish

Click Finish.

Step 16: Click OK

Click OK.

Step 17: Close the window

Click Close.

Step 18: Close the next window

Click Close again.

Step 19: Let Outlook sync

Open Outlook and wait for your folders to update. Leave it open until it only says All folders are up to date. This can take a few hours, depending on how much email you have.

When syncing finishes, restart Outlook.