More than worth it Rated 5 out of 5 stars

It works. It connects (once one figures out the full URL needed to talk to office365). It makes e-mail possible when a client decides they are too good to use open standards and instead insist on using a proprietary protocol.

And $10/y is a pittance considering the alternative is to use webmail, or Outlook.

This review is for a previous version of the add-on (24.5.3).