Rated 5 out of 5 stars

Truly an indispensable add-on for Thunderbird. I'd say EWS support is mature enough that it ought to be made the default option when configuring new accounts with Owl - performance is great and mail, contacts and calendar are working fantastically through both my Outlook.com account for home and on-premises Exchange account for work.

This review is for a previous version of the add-on (1.2.3). 

Hey! Thank you for that praise. We will consider to make EWS the default.