Rated 4 out of 5 stars

Notes are not "shareable" across IMAP, correct? It would be really SUPER if I could place notes on a message that would be viewable by other users on the same IMAP account.

But great product! Love it!

This review is for a previous version of the add-on (0.10.4). 

This is out of QNote use case. You can always share messages via shared folder. Adding IMAP manipulations would bloat up code base, hard to debug, introduce nasty bugs due various IMAP implementations floating around, etc.