How to Migrate Mailbird to Office 365? Best Solution

Written By
Shivansh Shukla

Updated on
October 14th, 2025

7 minutes Read
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Introdution: Mailbird is a well-known email client used to manage multiple email accounts at one time. However, users are transitioning to Office 365 because of the cloud storage, better collaboration, and security features. Once the user decides to switch, moving their entire Mailbird data to Office 365 seems confusing. In this article, learn the easiest ways to migrate Mailbird to Office 365. It includes both manual and professional solutions. The professional approach uses the MacSonik IMAP Backup Tool, which provides users with a fast, accurate, and secure backup.

David Smith Query:
“I am currently using Mailbird to manage my emails, but I have now made the shift and moved my organization’s email services to Office 365. I would like to move my Mailbird data without losing any data. What is the safest way to transfer my Mailbird to Office 365?”

Quick Solution to Migrate Emails from Mailbird to Office 365

The process to transfer Mailbird emails to Office 365 manually might be complicated if users have large mailboxes. Therefore, it’s better to use a professional method for migration, like the MacSonik IMAP Backup Tool for Mac. The data is directly migrated to Office 365 without the chance of data loss. Users can export emails directly while keeping their folder hierarchy, formatting, and metadata intact.

Migrate Mailbird to Office 365 using the Professional Tool

  1. First, download, install, and run the MacSonik IMAP Backup Tool on your Mac.
  2. Then, open the software and log in with your Mailbird IMAP credentials.
  3. Once your Mailbird mailbox folders have loaded, select the required mailboxes and click Next.
  4. After that, select Office 365 from the saving options and enter your Office 365 account login information.
  5. Now, use additional filters to move selected emails only.
  6. Finally, click Convert to start the migration process of Mailbird to Office 365.

The software will begin the migration of all your selected Mailbird emails, attachments, and metadata to your Office 365 mailbox, easily and safely.

Why Migrate from Mailbird to Office 365?

There are multiple benefits of migrating to Office 365 in comparison with Mailbird as a local email client. Here are the primary reasons most users prefer Office 365.

  • Access your emails on your schedule, with any device or time.
  • 365  Microsoft offers encryption along with multi-factor authentication. 
  • Access teams, OneDrive, SharePoint, and others seamlessly.
  • Never worry about emails being lost or corrupted.
  • Good for single users to small businesses, or enterprise scale. 

Best Method to Transfer Mailbird Emails to Microsoft 365

Let’s look at the differences between the manual and professional methods so you can choose the one that suits your needs best.

Comparison Factors Manual Method MacSonik IMAP Backup Tool
User-friendliness It requires technical knowledge It has a simple and user-friendly interface
Speed Slower, especially with large mailboxes Speedy migration with no interruption
Risk of Data Loss High chance of loss if not set up properly No chance of data loss
Bulk Migration Will only migrate one mailbox at a time Will migrate multiple Mailbird accounts
Attachments and Metadata Not sure if all attachments will be preserved Will preserve all attachments and metadata
Email Filters Not available By date, subject, or sender is available
Folder Hierarchy Will have to be changed manually Will maintain the folder structure
 

Detailed Manual Method to Migrate Mailbird to Office 365

You can migrate manually by first exporting your Mailbird emails into a file and then importing that file into Office 365. But know that this can be a very tedious task and not the easiest process. Please follow these instructions closely: 

01: Locate and Export Mailbird Emails into EML Format

  1. First, open Mailbird on your computer.
  2. Then, click on Settings AdvancedData Directory to your data directory from Mailbird, where the emails are retrieved and stored.
  3. After that, save your data in .eml format to a safe place.
  4. And, use the Mailbird export option or copy and/or drag the selected emails from Mailbird directly to your machine in an EML format.

02: Import EML Files into Outlook and Set Up Office 365 in Outlook

  1. Then, go to your Microsoft Outlook program on your computer.
  2. And drag each of the .eml files and drop them into your Outlook folders. 
  3. Further, select fileadd an account, and then select Microsoft 365
  4. Finally, enter your Office 365 credentials to set up.

03: Move Emails from Outlook to Office 365 

  1. Once set up, simply move folders by dragging and dropping emails from the Mailbird into the Office 365 mailbox. 

Limitations

  • This process can be time-consuming for large mailboxes.
  • It requires Outlook installation and manual effort.
  • There’s a risk of missing attachments or folder misplacement.
  • Hence, using a professional tool is the recommended and efficient choice for a smooth migration.

Professional Method to Directly Migrate Mailbird to Office 365

To migrate emails completely and without any errors in just one click, perform the following procedure in MacSonik IMAP Backup Tool

  1. To begin, download, install, and run the MacSonik IMAP Backup Tool on your desktop. 
  2. Next, select Single Mode, fill in your Mailbird credentials, then click the Login button. 
  3. Then, expand the folder tree and select the folder or emails you wish to migrate and click the Next button. 
  4. After that, select the Email Client option, followed by the Office 365 option, then click Next. 
  5. Next, enter your Office 365 credentials and click Login to authenticate your account. 
  6. Finally, configure any advanced filters, and click Start Process to begin.

This tool ensures:

  • 100% accuracy of data.
  • Folder hierarchy retention. 
  • Bulk migration capacity. 
  • Secure login authentication. 
  • Preview and select the emails you want to migrate.
Real-Life Situation to Move Emails from Mailbird to Office 365

John had been using Mailbird to manage his communications with clients for years as a marketing manager. But now that his company was moving to Microsoft 365, he needed to find a way to get all of his old and new emails into Office 365.

He attempted the manual export-import method but faced formatting problems and missing emails. Ultimately, he used the MacSonik IMAP Backup Tool. In minutes, John connected his Mailbird account and transferred all of his emails to Office 365 — with just a few simple clicks.

Within a few minutes, John had an organized and fully synced mailbox in Office 365 — without losing a single email.

Key Features of MacSonik IMAP Backup Tool

  • Easy migration of the Mailbird account to Office 365 without losing data.
  • Easily migrate from multiple IMAP-supported email clients.
  • You can filter your migration by date, subject, or sender
  • Keep the same structure, hierarchy, and attachments.
  • Easily export IMAP emails to Multiple file formats like PST, MBOX, PDF, EML, etc.
  • Safe Login authentication and migration without error.
  • It is compatible with all macOS versions.

Also Read: Migrate Email from Intermedia to Office 365

Conclusion

The blog discusses the best methods to migrate Mailbird to Office 365, without compromising data integrity. If your mailbox is small, the manual migration will work, but it is technical and complicated. Therefore, the MacSonik IMAP Backup Tool is a better alternative that works for both small and bulk migrations. With the backup tool, users can back up their emails in just a few steps, without losing data. It’s the perfect solution to keep user emails organized, accessible, and secure in Microsoft 365.

Frequently Asked Questions

Q1. Can I migrate Mailbird emails to Office 365 manually?

Ans: Yes, you can migrate Mailbird emails to Office 365 manually by first exporting them to .eml format and then importing those files into Outlook. Once done, you can configure your Office 365 account in Outlook and move all emails. However, this process is lengthy, technical, and not ideal for large mailboxes.

Q2. Will my email attachments and folder structure remain the same after migration?

Ans: Yes. The MacSonik IMAP Backup Tool ensures that all attachments, metadata, and folder hierarchy remain intact during migration. You’ll get an exact copy of your Mailbird mailbox in Office 365.

Q3. Can I migrate only selected emails from Mailbird to Office 365?

Ans: Yes, the MacSonik IMAP Backup Tool offers Date Range and Filter options. You can migrate emails based on a specific date range, subject, sender, or folder, saving time and avoiding unnecessary data transfer.

Q4. Do I need to install Outlook to use this tool?

Ans: No. Unlike the manual method, the MacSonik IMAP Backup Tool works independently. You don’t need Outlook or any additional application installed to migrate your emails.

About The Author:

Shivansh Shukla is a technical content writer who researches and provides reliable solutions to help users resolve their problems. He offers effective procedures for email migration, data backup, and file conversion for all technical and non-technical users.

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