Rated 1 out of 5 stars

I have to confirm the error...
Login is impossible due to a blank page.

The source seems to be, that it tries to open "outlook.live.com", which is being redirected to "outlook.office365.com" these days.
I had no errors opening "outlook.office.com" with some older add-on.
Please update the link to open!

Rated 3 out of 5 stars

Works by creating a separate Tab apart from you Thunderbird Calendar for quick access to you Microsoft.com Calendars. I wouldn't say it's an integration as much as a web browser tab within Thunderbird not exactly the solution I was looking for but it works.

Rated 1 out of 5 stars

App seems working, it opens a new tab with the login screen of Outlook. However, as soon as I hit the 'Login' butten, I only see a blank page. Nothing happens from there.