How to verify the OAB and EWS url for the Exchange Online Synchronizer

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It is possible to locate the OAB and EWS url's which are used for the Exchange Online Synchronizer, using Microsoft Outlook. Follow this guide to find out how this is done.

How to

Start Outlook.
In the taskbar you see the Outlook icon. Hold the CTRL key and Right-click on the Outlook icon.
You will get this menu

Select Test E-mail AutoConfiguration
Fill out the E-mail Address and password, and click test.

In Results, you can find the EWS and OAB urls.

If you get an error message, or no link to the OAB is supplied, it could be due to a setting on the Exchange server. Please contact your (local) Exchange Administrator and they will supply you with the correct URL's.


EWS = Exchange Web Services
OAB = Offline Address Book

The format to use for EWS and OAB: