Unfortunately, Thunderbird does not include Exchange ActiveSync (for license reasons) so you probably used either IMAP or POP. If you used POP, what you see in Thunderbird is just a copy and your local changes have no effect on the server. If you used IMAP, then the changes you make locally should sync up to the server. Now enter the required details of Exchange Server account for Thunderbird connect to Microsoft Exchange Server. After adding the credentials of Live Exchange Server account, click on Export to start the migration from Thunderbird to Exchange Server. When the process finished, a message will display like Conversion Completed. Install the TB Sync plugin and Provider for Exchange ActiveSync; Depending on the operating system you use, find the menu option Synchronization Settings (TBSync) Choose Account Actions, Add New Account, Exchange Activesync; Choose Office 365. Enter a descriptive name (for example, “Argonne”) and your @anl.gov email address. Welcome to Thunderbird Add-ons. Add extra features and styles to make Thunderbird your own. Check out our Mobile Add-ons. Provider for Exchange ActiveSync. Add sync support for Exchange ActiveSync (EAS v2.5 & v14.0) accounts to TbSync. Rated 5 out of 5 stars. Setting up an Exchange account in Thunderbird is slightly different to other email clients, as you have to setup the account manually. If this is the first email account setup on Thunderbird it will automatically open up a welcome window, where you will need to select Skip this and use my existing email.
We look at lots of email clients and mobile apps. And while most mobile apps (Bluemail, BlackBerry Hub, Outlook and Gmail) work nicely with Exchange ActiveSync, the same unfortunately cannot be said for Windows desktop clients.
As a result of performance issues, Microsoft discontinued support for Exchange ActiveSync (EAS) in Outlook 2016 making it difficult to sync email, calendars and contacts. That move left many desktop PC users looking outside the box alternatives to Outlook.
There are lots of desktop email clients – emClient, BlueMail, and Mailbird to name a few. And while most of these modern clients support Exchange, most of them do not include support for EAS. Enter Mozilla Thunderbird.
Thunderbird might actually be the first and oldest Outlook alternative, and it also provides a stable EAS solution.
Here’s how it works. By default, Thunderbird supports POP3 and IMAP connections for email, and using IMAP you can sync your email to your preferred IMAP mail server. To synchronize calendars and contacts, all you have to do is install a simple little Thunderbird Add-on called TbSync which uses EAS and/or CalDAV/CardDAV protocols to connect to your Groupware server.
To make the EAS connection, you will need to enter your groupware server name, email address and password.
Here is a link to download Thunderbird:
Thunderbird Exchange Activesync Account
After you get it installed, you can get the TbSync Add-on by clicking the menu icon and clicking Add-ons / Get Add-ons. Search for tbsync and then add each of the following add-ons: 1) TbSync and 2) Provider for Exchange ActiveSync.