Usability improvement Rated 4 out of 5 stars

Hi all!

Very useful software to maintain meetings and tasks. But please add the ability to attach the files to the invitations. Must have thing for the companies!

--
Regards, Andrey Bondarenko

This review is for a previous version of the add-on (2.6.4). 

Not via real attachments, but this should be possible when you use the Filelink feature of Thunderbird (Options > Attachments > Outgoing). If you don't want to use an online service, you can use a company DAV server with this extension: https://addons.mozilla.org/en-US/thunderbird/addon/webdav-for-filelink/