How to Export Mulberry Mail to Microsoft 365 Cloud Account?

Ritu Roy | how to Mac macOS MBOX software technology | 4 minutes read | Modified on: 12-05-2026

Mulberry is an open-source email client that was first developed by Cyrusoft in 1995. Initially designed for Mac users, it later expanded its compatibility to other operating systems, including Windows, Linux, and FreeBSD. In its active phase, Mulberry was appreciated for its reliable performance and stable email handling capabilities.

However, the project was officially discontinued in 2007, and no further updates or enhancements have been released since then. On the other hand, Microsoft 365 (formerly Office 365) is a modern cloud-based email and productivity platform that continues to evolve with regular feature upgrades, security improvements, and performance optimizations.

Due to its advanced capabilities, cloud accessibility, and long-term support, many users are now shifting from Mulberry to Microsoft 365. This transition ensures better security, improved collaboration, and a more reliable email experience for modern business and personal communication needs.

Reasons to Move Mulberry Mail to Office 365

There are several important factors that encourage users to switch from Mulberry to Microsoft 365 for their email management needs:

  • Flexible and scalable plans: Microsoft 365 offers subscription options that suit individuals, small businesses, and large enterprises, allowing users to easily upgrade as their requirements expand.
  • Anywhere access: Unlike traditional desktop-based email clients, Microsoft 365 enables users to check emails, calendars, contacts, and tasks from any device with an internet connection, ensuring seamless mobility.
  • Better speed and usability: The cloud-based environment provides a smoother experience with improved mailbox organization and faster performance compared to older email systems.
  • Handles large mail data efficiently: Microsoft 365 is designed to manage high volumes of emails and attachments without slowing down or causing performance issues.
  • Stronger security and filtering: Modern protection systems, including advanced spam and phishing detection, help safeguard user accounts more effectively than legacy email clients.
  • Integrated productivity ecosystem: Along with email, users get access to tools like document editing, collaboration apps, and cloud storage, improving overall productivity within a single platform.

Because of these benefits, migrating from Mulberry Mail to Microsoft 365 is a practical step toward a more secure, efficient, and modern communication environment.

Methods to Transfer Mulberry Mail to Office 365 Primary Mailbox

When migrating data from Mulberry to Microsoft 365, users can generally choose between two approaches. One is a manual method that involves multiple steps and technical effort, while the other is an automated solution that simplifies the entire migration process. Below is an overview of both options.

Read More – Import Mulberry Mailbox to Outlook

Manual Method to Move Mulberry Mailbox to Office 365

Migrating data from Mulberry to Microsoft 365 manually is possible by using MBOX as an intermediate format, since Mulberry stores mailbox data in MBOX while Office 365 works through Outlook-supported formats.

#1: Export Mail from Mulberry in MBOX Format

  • Launch the Mulberry email application
  • Select the required mailbox folders or messages
  • Navigate to the export option and save data as MBOX files
  • Store the exported files in a safe location on your system

#2: Convert MBOX into Outlook-Compatible Format

  • Since Outlook does not support MBOX directly, conversion is required
  • Use a third-party tool to convert MBOX files into PST or EML format
  • Ensure the conversion preserves emails, attachments, and folder structure

#3: Import Data into Outlook

For PST files: Open Outlook and go to File > Open & Export > Open Outlook Data File, then select the converted PST file

For EML files: Drag and drop the files into the desired Outlook folder

#4: Configure Office 365 Account in Outlook

  • Add your Office 365 account through Account Settings > Add Account
  • Allow Outlook to complete synchronization with the cloud mailbox

#5: Transfer Emails to Office 365 Cloud Mailbox

  • Once imported, move or copy emails into the Office 365 mailbox folders
  • This ensures the data is uploaded and synced with the cloud account

Limitations of the Manual Approach

  • The process involves multiple stages and can be time-consuming
  • There is a risk of data loss or formatting issues during conversion
  • Maintaining folder hierarchy, attachments, and email properties can be difficult
  • It requires technical knowledge of email formats and Outlook configuration, making it less suitable for non-technical users

Export Mulberry Mail to Office 365 Using MacMister Migration Tool

Manually transferring emails from Mulberry to Microsoft 365 can be complicated because MBOX files are not natively supported by Outlook or Office 365. To simplify this process, the MacMister MBOX Converter for Mac provides a direct migration method that allows users to move Mulberry mailbox data into Office 365 without needing multiple conversion steps.

Advantages of Using MacMister Mulberry to Office 365 Tool

  • Direct cloud migration: Enables users to transfer Mulberry emails straight into Office 365 mailboxes without intermediate file formats or manual processing.
  • Maintains original structure: Keeps email formatting, attachments, metadata, and folder hierarchy intact throughout the migration process.
  • Simple and accessible interface: Designed to be easy to use, making it suitable for both beginners and advanced users.
  • Supports various MBOX-based clients: Works with multiple email applications that use MBOX format, not just Mulberry.
  • Bulk email migration: Allows multiple MBOX files to be processed at once, reducing time and effort during large-scale transfers.
  • Selective migration options: Users can filter emails based on folders, date ranges, or specific criteria to control what gets migrated.

Final Summary

Migrating data from Mulberry Mail to Microsoft 365 is an important step for users looking to upgrade to a modern, cloud-based email environment. As discussed, there are two approaches: manual migration using MBOX to Office 365 Converter and an automated tool-based method.

While manual migration is possible, it often involves multiple steps and a higher risk of errors or data inconsistencies. In contrast, a dedicated migration tool offers a faster and more reliable way to transfer emails while preserving data integrity and structure.

Using a professional solution is generally the preferred option for users who want a smooth and hassle-free migration experience. Most tools also provide a trial version, allowing users to evaluate functionality before performing the complete transfer.