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Are you looking for a way to migrate your emails, contacts, and calendar data from Thunderbird to Outlook 365? With the right tools and knowledge, you can make the switch without losing any important data. In this blog post, we’ll walk you through the steps of transitioning from Thunderbird to Outlook 365, so you can make the move in no time. 

Migrating from Thunderbird to Outlook 365 is a fairly straightforward process. To start,  

1. Firstly, you'll need to export your emails from Thunderbird in the form of MBOX files.

2. You'll then need to log in to your Outlook 365 account and navigate to the Import and Export page.

3. Once you're there, you'll select the Import from File option and choose the MBOX files you exported from Thunderbird.

4. Outlook 365 will then begin the import process. 

Once it's finished, your emails will be available in Outlook 365. This process is quite simple, as Thunderbird allows exporting the mailbox data into MBOX format. Also, Office 365 allows importing data in mbox format. 

Besides this manual method, you can use any email migration tool. These tools will guide you through the steps of exporting your emails from Thunderbird and then importing them into Outlook 365. Make sure to back up your Thunderbird data before beginning the migration process.

Detail Guide: https://www.regainsoftware.com/blog/migrate-thunderbird-emails-to-outlook-365/