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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 ...

Answer : You need port 993 , the SSL IMAP port. Port 995 is the SSL POP3 port. I think Gmail's IMAP can only be accessed on port 993. $hostname = "{imap.gmail.com:993/imap/ssl/novalidate-cert}"; I had the same error and found a different solution. I have added debug info into host: "{imap.gmail.com:993/debug/imap/ssl/novalidate-cert}INBOX"; When I read php error log, I found Unknown: [ALERT] Please log in via your web browser: https://support.google.com/mail/accounts/answer/78754 (Failure) (errflg=1) in Unknown on line 0 Open link, and follow instructions. Search for Your app might not support the latest security standards. Try changing a few settings to allow less secure apps access to your account. Click on link and enable less secure app access. Then it works for me.