Written by Thomas Speekenbrink
In case the autodiscover fails you can manually override the Exchange Web Services and Offline Address Book urls.
- Go to Manage Profile - Configure Systems
- Click on 'Show Settings' in the Advanced Settings section
- Set the 'Use Autodiscover' option to No
- Fill in the EWS and OAB urls and Save
How to retrieve the EWS and OAB url is explained in this article: http://kb.infobridge.com/hc/en-us/articles/208151355