Dev Stack Source

Answer : I believe the feature you are looking for is called 'Unified Folders' which works on both IMAP and POP3 protocols. The official site location: http://kb.mozillazine.org/Global_Inbox#Unified_Folders Quote from the site: Unified Folders (originally named Smart Folders when it was added in 3.0) is a folder pane view which looks like a global inbox account by merging the contents of all inbox folders (both POP, IMAP and local folders) from all accounts. It also shows the inbox of each account as a child folder of the unified Inbox account. Any messages in an inbox shows up in both the root of the unified Inbox, plus the child folder of the unified Inbox for that account. To use this functionality: View >> Folders >> Unified I have verified that this does work on Thunderbird 12.0.1 using Ubuntu 12.04 . The KB article I found above it a bit old but still holds correct information about the functionality of the 'Unified Folders...

Answer : The following extension verifies DKIM signatures: https://addons.thunderbird.net/thunderbird/addon/dkim-verifier/ Wiki with some more information on the extension: https://github.com/lieser/dkim_verifier/wiki

Answer : I had some problems using DavMail (mainly with the tray icon). And the calendar was not easy to use. So I've searched deeper. And I found TbSync which works well together with the EAS Provider. It works out of the box. No technical configuration no background process. I just gave my account and password and everything else was detected. Addresses and Calendars are now working like a charm. The only tips you should know with TbSync is that after installing it (as an Tools → Add-ons ) the configuration can be accessed from Tools → Synchronization Settings (TbSync) : ... or alternatively under Tools → Add-on Options → TbSync : The easiest way that I have found is to use the Davmail connector. This is a Java applet that runs in the background on your Windows 10 PC. To Thunderbird it looks like IMAP for receiving email, SMTP for sending it, and LDAP for address book queries. On the Office365 side it talks the native protocols. I've been using it for about five years ...