Export Office 365 to MBOX Format: Quick and Easy Guide 2026

Summary: Office 365 mailboxes usually hold years of business conversations, invoices, and project records. Many users now export Office 365 to MBOX for offline storage or mailbox migration into Thunderbird and other email clients. Manual methods exist, but larger mailboxes often create syncing delays and incomplete exports. MacProTools Office 365 Backup Tool helps users create MBOX copies from Office 365 accounts while keeping mailbox folders and attachments available after export.

Quick Answer

How can I get Office 365 mailboxes in MBOX format for my company without losing mailbox folders or attachments?

You can manually export emails from Office 365 to MBOX through Thunderbird after IMAP syncing finishes, but larger mailboxes often slow down or stop midway. MacProTools Office 365 Backup Tool gives users a more direct way to get it done while keeping mailbox folders, attachments, and email data properly arranged.

What Is the DIY Way to Convert Microsoft 365 to MBOX?

Microsoft 365 itself cannot create MBOX files directly. Because of that, many users connect their mailbox with Mozilla Thunderbird first and later export folders through an add-on. The process works, but every mailbox folder needs separate handling during export. Follow these steps below:

1. Open Thunderbird and move into Account Settings.
2. After that, click Mail Account and choose Add Account.
3. Now enter your Office 365 email address and password. Press Continue.
4. Select the account type. Thunderbird then configures the mailbox automatically.
5. Once syncing finishes, right–click in the folder section and create a New Folder.
6. Next, copy your Office 365 emails into this newly created folder.
7. Then, right-click on that folder again from the left-side panel.
8. Choose the Export option from the available menu list.
9. As the last step, choose the saving location and store the mailbox in MBOX format.

With this said, your steps to convert Office 365 mailbox to MBOX are completed. But this method is not very effective for large or enterprise-level migrations.

What Are the Drawbacks of DIY MBOX Export?

• You export one mailbox folder at a time in Thunderbird.
• Bigger Office 365 mailboxes usually take much longer to load.
• A weak internet connection may interrupt mailbox syncing midway.
• Thunderbird needs extra extensions before the MBOX export starts.
• One skipped folder means the backup stays incomplete later.
• Repeating the same export steps becomes tiring after some time.

What Is the Easier Way to Export Office 365 to MBOX?

Manual Office 365 exports usually become frustrating once the mailbox size starts increasing. MacProTools Office 365 Backup Software helps users transfer Office 365 mailboxes to MBOX without repeatedly syncing folders through Thunderbird. The software downloads mailbox emails, attachments, and folder data together into local MBOX files. Users can also export multiple Office 365 accounts without handling every mailbox folder separately. Apart from all this, you can also migrate Office 365 to Gmail when switching email clients.

Follow The Procedure To Export Office 365 Mailbox to MBOX:

1. To start, download and run the Office 365 Backup Wizard on your PC and click on Backup.
2. Further, check the Use Modern Authentication option and fill in your Email ID and tap on the Sign In button to authenticate your account.
3. Moving ahead, select the folders that you want to backup from the tree structure and hit Next.
4. After that, next to Save/Backup/Migrate as an option, choose MBOX as the saving format from the drop-down list.
5. Next, you can pick from the filters like Date Filter or Remove Duplicates for selective or incremental backup.
6. In the end, tap on Destination Path to browse and specify the saving path, and then click on Next to initiate the process.

Why Do Users Prefer This Export Tool?

• Office 365 emails can be saved directly as MBOX mailbox files.
• Users choose only the folders they actually want to export.
• Older or unnecessary emails can be excluded during export.
• Handling several Office 365 mailboxes takes much less manual effort.
• Exported mailbox folders still appear in their original sequence later.
• Duplicate emails do not keep appearing during repeated export jobs.
• Attachments can move together with Office 365 mailbox emails.
• The utility also lets you export Office 365 to EML for offline access to data.

To Wrap Up

Office 365 mailbox export becomes difficult once the mailbox size and folder count start increasing. Thunderbird methods still work, but repeated syncing and folder-by-folder export take unnecessary effort later. MacProTools Office 365 Backup Tool gives users a simpler way to export Office 365 to MBOX while keeping mailbox folders and attachments available after export. Local MBOX files also help users access older mailbox data without depending completely on active Office 365 accounts.

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