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Export Thunderbird to Outlook through Webmail account:
Phase 1: Add Webmail Account in Thunderbird
Firstly, log-in Webmail Account, Click on the Gear icon and open the webmail settings.
Choose the Forwarding and POP/IMAP>> Enable IMAP option.
Now configure the IMAP account & click on the Save Changes option
Run Thunderbird, provide the name, email address and password of the Thunderbird account and click on the Continue button to open it.
Click on the IMAP checkbox and provide the all necessary information. After that click on the Re-test button.
After providing all the information successfully, select the Create a new account option.
In the end, open any email message to verify the account in Thunderbird.
Phase 2: Configure Webmail Account to Outlook
Firstly open the File menu & click on the Add Account.
Then a dialog box will appear, here choose Manually Configure Server Settings or Additional Server Types and click the Next.
After that click on the Internet Email>>Next button to proceed.
Now provide name, email address and password in the dialog box.
Now from the Account Type choose the IMAP option for the IMAP mail account.
Here, type imap. <servername>.com and smtp. <servername>.com for the Incoming and Outgoing server sequentially.
Then click on the More Setting.
Go to the Outgoing Server and select the My Outgoing Server (SMTP).
Then, click on the Use Same Settings as My Incoming Server option.
Under the Incoming Server Port enter the 993 port number.
Next select This Server Requires an Encrypted Connection Option.
Then for outgoing server enter 587 port number and click Ok button to exit the dialog box.
Click on the Test Account setting option to check the account setting.
After getting “your account setting are correct” message click on the Next Button.
In the end, import Thunderbird MBOX files to Outlook 2016.