Review for Owl for Exchange by Mark Nagel
Rated 5 out of 5 stars
I used to really like this, but since TB102 the dynamic accounts created by the add-on are lost in saved searches at each restart. I sent a support request, which went into a black hole apparently. I will happily change my rating if someone from Beonex will engage.
UPDATE: Thank you for responding to my support request and here! Looking forward to the update...
Thank you for your bug report. Thunderbird 102 changed (again!) the startup timing of addons, which again broke a few things. We fixed the obvious problems, but this may have broken Saved Searches. We'll have to look into this.
To create your own collections, you must have a Mozilla Add-ons account.