How to import OLM to Office 365 Account? Complete Guide

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  • Updated on September 23rd, 2025

Jenny’s Query: “I have around 12 GB of OLM files transferred from my old Outlook, and now I want to save these OLM files into my Office 365 mailbox. Therefore, I’m worried about losing attachments or corrupting email formatting. What is the secure way to migrate OLM to Office 365?”
Introduction: This situation is very common. Therefore, many Outlook users mostly face difficulties when they switch to Microsoft 365. Thus, Outlook stores its data in OLM files, but Office 365 does not support OLM directly. However, users search for a secure and reliable way to import OLM to Office 365. Moreover, there are manual methods and a professional CloudMigration OLM Converter tool. This blog will guide you on how a professional tool offers a quick way to migrate without any loss.

Real-World Scenario:

There is a Mac Outlook user planning to save his entire email data to Office 365 for better accessibility & management. Since Microsoft 365 ensures advanced tools & security, shifting to Office 365 seems practical. However, uploading OLM files won’t work, and manually forwarding emails one by one is not possible. That’s why a structured approach is required to import files securely.

 

Simple Steps to Import OLM File to Office 365

  1. Download and install the OLM Converter Tool.
  2. Select File(s)/Folder to add OLM files.
  3. Preview & Verify the data.
  4. Save the OLM file in MBOX format.
  5. Apply the filters & Start Process.

Key Reasons to Import OLM to Office 365

  • First, Office 365 allows you to access all the details anytime from any device.
  • Connecting with Microsoft Teams and OneDrive enables smooth teamwork and file sharing.
  • Moreover, Office 365 provides high-end security for your emails.
  • All your data can be stored and managed well in one account.
  • Therefore, moving OLM to Office 365 helps minimize the risk of corruption or deletion.
  • MS Outlook works effortlessly on both Windows and Mac.

Manual Approach to Move OLM files to Office 365

If you don’t want to download any external software or tools, you can work with manual methods. But the manual methods consume time and effort, and still come with limitations. Therefore, there is no direct way to upload OLM files to Microsoft 365. However, you can use an IMAP installation technique. 

The following are the steps to import OLM to Office 365:

Method: Using IMAP (Gmail or other IMAP Email Client)

  1. Firstly, set up a Gmail account in MS Outlook for Mac.
  2. Secondly, import the OLM file into your Gmail account.
  3. After that, install the same Gmail account in Office 365.
  4. Lastly, drag and drop emails from Gmail folders into the Office 365 mailbox.

Limitations of the Manual Method to Migrate OLM to Office 365:

  • First, it requires multiple email accounts (IMAP-supported).
  • Thus, it is very time-consuming for large OLM files.
  • Also, there is a risk of losing email formatting and attachments.
  • Therefore, the manual method is not suitable for users with minimal technical knowledge.

Professional Method to Import OLM to Office 365

The most reliable and direct solution is to use the CloudMigration OLM Converter Tool. This tool allows you to import OLM to Office 365 directly without needing any email client. Therefore, it ensures complete data migration, including all the details remaining intact. With its advanced filter options and a user-friendly interface, even non-technical users can migrate their OLM files effortlessly.

One-Time Service Available
If you don’t want to buy software, CloudMigration also offers a one-time conversion service. Their experts handle the complete migration process, ensuring 100% accuracy and data security.

Here’s the step-by-step guide to Import OLM File to Office 365:

  1. Firstly, download & install the CloudMigration OLM Converter Tool → Continue.
    How to import OLM to Office 365 Account? Complete Guide
  2.  

  3. After that, click on Select Files/Folders and add the OLM file that you want to convert → Open → Next.
    How to import OLM to Office 365 Account? Complete Guide
  4.  

  5. Further, expand the tree structure → Preview the content → Next.
    How to import OLM to Office 365 Account? Complete Guide
  6.  

  7. Now, save the OLM file in the Office 365 email client.
    How to import OLM to Office 365 Account? Complete Guide
  8.  

  9. Subsequently, enter your Microsoft 365 sign-in credentials.
    How to import OLM to Office 365 Account? Complete Guide
  10.  

  11. Afterward, apply the advanced filter → Start Process.
    How to import OLM to Office 365 Account? Complete Guide

Benefits of moving OLM files to Office 365

  • First, the tool accesses all emails from any device through the cloud.
  • Second, it keeps the storage secure and no risk of data loss.
  • Also, the automated tool organized the emails, contacts, and calendars in a single mailbox.
  • There is better collaboration with Microsoft Teams and OneDrive.
  • The highly efficient tool has the feature to Import OLM files into Apple Contacts.
  • Therefore, the tool comes with advanced filters that allow selective migration.

Why Choose CloudMigration OLM Converter Tool?

  • It directly imports OLM files into Office 365 without any other email clients.
  • Also, maintains original folder structure, metadata, and attachments.
  • Therefore, the tool supports multiple migrations of OLM files.
  • The converter software provides a preview feature before migration.
  • Though it is more compatible with both Windows and Mac systems.
  • If you want to save in other file formats, it can also convert OLM to PST without any loss.
  • This software also guarantees a free demo version available to test before purchase.

Note: If you want to explore more, you can also go through our reference guide to convert OLM to MBOX.

Conclusion

To sum up, importing OLM files into Office 365 can be challenging if you depend on manual methods. As they don’t work when dealing with large files or multiple mailboxes. The CloudMigration OLM Converter Tool offers a simple, fast, and secure way to import OLM to Office 365 with complete accuracy. Whether you choose to do it yourself or opt for the one-time migration service, you can ensure smooth data transfer without worrying about loss.

Frequently Asked Questions

Q1. Can I directly import OLM files into Office 365?

Ans. No, Office 365 does not support OLM files directly. You can either use a manual IMAP method or a professional OLM Converter Tool to migrate OLM to Office 365.

Q2. What is the easiest way to import OLM to Office 365?

Ans. The simplest and most reliable method is using the OLM Migrator Tool, as it directly transfers OLM files into your Office 365 account without requiring any additional setup and without any loss.

Q3. Can I selectively import OLM files into Office 365?

Ans. Yes, with the help of an automated converter tool, you can apply filters such as date range, folder selection, and specific mailbox items to selectively import OLM files.

Q4. Do I need technical skills to import OLM to Office 365?

Ans. Not at all. The reliable software is designed with a user-friendly interface, so that even non-technical users can easily import OLM files into their Office 365 account.

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