2 Ways to Import Mac Outlook OLM File Emails to Office 365

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  • Published on
    October 23rd, 2019
  • Updated on
    March 20, 2023
  • Read Time
    7 minutes
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Summary:- OLM files are created on the Outlook applications installed on a Mac-based system. When a user wants to switch from Mac Outlook to Office 365, he will have to import OLM to Office 365. So, in this article, we will cover two effective methods to migrate all emails from Mac Outlook OLM files to Office 365 including attachments. You can make use of the OLM to Office 365 Migration Tool or use some manual methods to do the importing process.

MS Outlook is the most widely used email client, especially in a professional environment. Outlook is available in Windows as well as Mac operating systems. The only difference is the file format for data storage. Outlook creates the PST file on windows, whereas Mac creates an OLM file format for data storage. First, I will give the difference between MS Outlook and Office 365, which will clear all your doubts and then explore the methods to import OLM file emails to Office 365.

Microsoft Outlook VS Office 365

Basis MS Outlook (Mac) Office 365
Cost When you purchase MS Office 365, you will also have to pay for Outlook at that time. Subscription depends upon your chosen plan. It may be yearly or monthly.
Availability Microsoft Outlook is a part of Office 365 Suite. Office 365 is a family product.
Updates Security updates can upgrade, but users can not upgrade any other features. Users can easily upgrade or change their subscription plan per their comfort level.
Installation of MS Outlook on one or more Desktop/PC Users can download the application either on their Mac or Windows. They have a better choice to opt for Office 365 because users can easily download the O365 application on up to 5 PCs.

Here, you can see a brief difference between Outlook and Office 365. I hope that it will be justifiable why users need to import OLM to Office 365. Let’s check out the methods to import Outlook Mac Emails to Office 365. 

Methods to Import Emails and Attachments from OLM to Office 365

You can see two major methods to upload OLM to Office 365 and can go through any method and get your task done.

  1. Use IMAP to Import OLM files to Office 365
  2. Use OLM to Office 365 Migrator to Migrate OLM to Office 365.

Here, you can check out both methods in detail. You will need to convert OLM to PST if you want to do the migration to Outlook otherwise for Office 365, you can follow the methods given. Let’s start with the first process to transfer OLM emails to Office 365

Method 1: Import OLM Files to Office 365 Using the IMAP Account

This manual method consists of three sub-methods that you will have to implement.

  • Configuring Gmail into Mac Outlook
  • Transfer Mac Outlook data to Gmail
  • Configuring Gmail into Windows Outlook

Step 1: Configuring Gmail Into Mac Outlook

Firstly, you will have to configure your Gmail account into Mac Outlook and you can check out the steps below.

  • The first method is open Mac Outlook, then browse the Outlook tab and select preferences.
  • Within the Personal Setting option, choose the Accounts option.
  • After that, click the + icon and select the Email option.
  • Enter the username and password of the Gmail account and click on Add account option.
  • You will find then your Gmail account will add to your Mac Outlook profile.

Step 2: Transfer Mac Outlook Data to Gmail

After finishing the first step, secondly, you will have to transfer Mac Outlook data to your Gmail account.

  • Open the Mac Outlook application, then right-clicks on Configured email account Folder. Select a New folder.
  • Give a new name to the folder. Click on the File menu and select the Import option.
  • Then select Outlook Data file within the import option and click Next.
  • Choose the radio button of Outlook for Mac Data file(.olm).
  • Opt for the OLM file and hit on the import option.
  • Once the processing did you will receive a complete import message. Then click on the Done button.
  • You will get an import message in Mac Outlook. Then choose all the messages and right-click on them.
  • Choose the move option and then select the folder option.
  • Finally, all the emails will get moved to the configured Gmail account.

Step 3: Configuring Gmail Into Windows Outlook and moving them into Office 365.

Lastly, configure Gmail account to a Windows Outlook account. After that, move all OLM emails to Office 365.

  • Initially, Open the Outlook application.
  • Browse the file menu and then select Add account.
  • You will find two options there. Select Manual setup or additional server type option. Then click on Next.
  • Choose the POP or IMAP option.
  • Fill in your name and email address under the user information.
  • Choose POP3 in the server information. In the incoming mail server, fill pop Gmail and smtp.gmail.com in an outgoing mail server.
  • Mention your Gmail address and password in the login information.
  • After that, click on the More settings option.
  • Open the Outgoing Server tab in internet email settings and tick My Outgoing Server requires authentication.
  • Input 995 as the incoming server and 465 as an outgoing server in the advanced tab. Also, ensure that the option “This server requires an encrypted connection(SSL)” option tick. Then click on OK.
  • Once all the resultant files are migrated in the PST format, opt for the Office 365 account to import the desired PST files to access the account using the Cloud platform. You can follow the Network Upload method.

You can see we have successfully completed the manual method to import OLM to Office 365. But every manual method has some loopholes. You have seen that the above procedure is too complicated and time-consuming. Even there is a high risk of losing vital data during the migration process of OLM files to O365. If you do not want to face such challenges, you can go with the Sysinfo OLM to Office 365 Converter.

Method 2: Reliable Solution to Migrate OLM to Office 365

Sysinfo OLM to O365 Migrator is the most comprehensive and efficient utility that helps to perform the conversion process efficiently. This utility ensures no data loss during the conversion. Also, it exports various file objects like email messages, calendars, contacts, journals, tasks, etc. Users can accomplish bulk conversion processes from OLM files to O365. Moreover, I will mention the steps which will make you better understand.

Steps to Import OLM Into Office 365

  • Download and run the tool on your local system.
  • Moving ahead, Browse the desired OLM files and preview them in a preview panel.
  • Now, select Office 365 as a saving format and authenticate the login process.
  • In the end, click on the Convert button.

All OLM file emails will be imported to Office 365. Now, you can login to your Office 365 account and access all OLM file emails.


In this article, you have seen various methods to Import OLM to Office 365. Manual and direct methods have been explained above. You are free to choose any of the methods according to your suitability and move all emails of your Mac Outlook OLM to Office 365.

Frequently Asked Questions

Q. Why OLM file don’t Open in Office 365?

Ans – OLM files are created on the Mac version of MS Outlook and they are incompatible with Office 365 as O365 is a web-based email client application. Therefore, you will need to import the OLM file emails to Office 365.

Q. How can I migrate emails from Mac Outlook to Office 365?

Ans – You can make use of the OLM to Office 365 Migration Tool that will help you to move every single email from your OLM file to Office 365.

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