# Thunderbird to Office 365 Migration

**URL:** <https://community.greythr.com/t/thunderbird-to-office-365-migration/22151>\
**Category:** General Discussions\
**Created:** [February 28, 2026, 5:14pm UTC](https://community.greythr.com/t/thunderbird-to-office-365-migration/22151 "2026-02-28T17:14:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jackera](https://avatars.discourse-cdn.com/v4/letter/j/c57346/32.png) [@jackera](https://community.greythr.com/u/jackera)\
**Post date:** [February 28, 2026, 5:14pm UTC](https://community.greythr.com/t/thunderbird-to-office-365-migration/22151/1 "2026-02-28T17:14:52Z")

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**Advik Thunderbird Converter Tool** is a powerful and user-friendly utility designed to streamline the process of transferring emails from Mozilla Thunderbird to Microsoft Office 365. This dedicated tool supports direct migration, allowing users to import Thunderbird mail folders, including Inbox, Sent, Drafts, and custom folders, into their Office 365 accounts with ease. It ensures 100% data accuracy by preserving email formatting, attachments, metadata, and folder structure during the [Thunderbird to Office 365 migration](https://www.adviksoft.com/blog/how-to-export-emails-from-thunderbird-to-office-365-account/) process. The software comes with advanced features such as batch migration, selective folder export, and compatibility with all versions of Windows. Ideal for both personal and professional use, it is the perfect solution for anyone looking to switch from Thunderbird to Office 365 without data loss or technical hassle.

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**Author:** ![kalvinmark1](https://sea2.discourse-cdn.com/flex024/user_avatar/community.greythr.com/kalvinmark1/32/6779_2.png) [@kalvinmark1](https://community.greythr.com/u/kalvinmark1)\
**Post date:** [March 2, 2026, 4:14pm UTC](https://community.greythr.com/t/thunderbird-to-office-365-migration/22151/2 "2026-03-02T16:14:39Z")

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Using **[KDETools Thunderbird to Office 365 Converter](https://www.kdetools.com/thunderbird/)** tool is a user-friendly solution to transfer multiple Thunderbird mailbox data to Microsoft Office 365 accounts directly. The Thunderbird to Office 365 Migration tool allow users to migrate Thunderbird Mailbox to Office 365 cloud server with all items - emails, contacts, calendar, tasks, notes, folders, attachments etc

You can download free trial version allow to converts first 30 items from each folders

> **[Thunderbird to Outlook Converter to Export Thunderbird to PST](https://www.kdetools.com/thunderbird/)**
>
> Thunderbird to Outlook Converter Online to Import Thunderbird to PST for Outlook 2019, 2016, 2013, 2010, 2007 etc. Thunderbird to Outlook Migration to convert, export Thunderbird MBOX to PST, Office 365 Gmail, G-suite, Exchange Server with...

 ![thunderbird2pst-banner](https://us1.discourse-cdn.com/flex024/uploads/greytip1/original/2X/9/9b439b1dcbba821c0576b07f9466f430be07453f.png)

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**Author:** ![tylerhoward](https://avatars.discourse-cdn.com/v4/letter/t/3d9bf3/32.png) [@tylerhoward](https://community.greythr.com/u/tylerhoward)\
**Post date:** [July 30, 2026, 11:18am UTC](https://community.greythr.com/t/thunderbird-to-office-365-migration/22151/3 "2026-07-30T11:18:06Z")

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Migration from Thunderbird to Office 365 can be done; however, as Thunderbird keeps emails in MBOX format, you’ll need a way to transfer that data to Microsoft 365. Manual methods are fine for a few emails, but they become difficult when migrating complete mailboxes.

I had to [migrate the whole Thunderbird mailbox to Microsoft 365](https://www.datavare.com/software/mbox-to-office-365-converter-expert.html) and wanted to keep the original MBOX files unchanged. **DataVare MBOX to Office 365 Converter Expert** made that easier by copying the mailbox directly to my Office 365 account instead of requiring multiple manual steps.

**What I found useful in this tool:**

- Copies Thunderbird MBOX emails directly to Office 365.
- Preserves attachments, metadata, and folder hierarchy.
- Supports bulk MBOX file migration.
- Lets you migrate selected folders when needed.

I recommend migrating one mailbox first to verify everything before transferring the remaining data.