Rated 5 out of 5 stars

Excellent add on - is there any way that it can be used on an imap system so all users of shared email accounts can see the notes? Thanks.

This review is for a previous version of the add-on (2.2.1). 

In order to share your notes with other users (or access them by yourself on a different PC), you can store the notes on a shared network drive (WebDAV, Windows Share / Samba, NFS -- anything you can mount on your operating system) and configure the xnote.storage_path property accordingly. See http://www.froihofer.net/xnote/ for details.