How Can I Import OLM to Office 365 From Several Mailboxes?

S

Sunilkumar@123

Active Member
Moving data from several OLM mailboxes can become difficult when each mailbox has to be handled separately. A structured migration process helps keep the mailbox data organized and reduces repetitive work. It is useful to prepare the required OLM files first and then process the mailbox data according to the migration requirements.

The Aryson OLM Converter Tool provides a way to process OLM files and prepare their mailbox data for Office 365. You can add the required OLM files and use the available conversion options to handle the mailbox data. This can be useful when working with OLM data from multiple mailboxes and preparing it for an Office 365 environment.

For users who need to Import OLM to Office 365 from several mailboxes, the tool supports all versions of Windows and Mac. This allows the same OLM conversion workflow to be used across both operating systems.
 
For importing OLM files from several Mac Outlook mailboxes into Microsoft 365, a dedicated OLM to Office 365 migration tool can simplify the process. TrustVare OLM to Office 365 Converter supports bulk migration of OLM files and can export emails, contacts, address books, events, and attachments directly to an Office 365 account. It supports Outlook for Mac 2011, 2016, and 2019, along with File Mode and Folder Mode for selecting individual or multiple OLM files. The basic workflow is: add the OLM files, preview the mailbox data, choose Office 365 as the destination, authenticate the target account, select the required folder, and start the migration. A demo version is also available for testing before a full migration.
 
I completely understand—exporting OLM files as a backup from Outlook for Mac is simple enough, but getting those OLM files imported back into Office 365/subscription accounts can be a hassle, especially since the New Outlook for Mac doesn't support direct OLM importing natively.
A quick workaround if you want to stick with native tools is to switch back to Legacy Outlook for Mac, complete the OLM import, and then switch back to New Outlook.
However, if you are handling multiple mailboxes or want a more direct route, using a dedicated tool like BitRecover OLM Converter makes the process much easier. It lets you import OLM files directly into Office 365 in bulk without needing to manually toggle between Outlook UI versions or configure each account manually.
 
If you have several Outlook for Mac mailboxes in OLM format, a practical approach is to convert the OLM data to PST first and then use the resulting PST files for your Microsoft 365 migration. I'd use a tool that can preview the OLM mailbox before exporting, because it helps verify emails, contacts, calendars, folders, and attachments before migration.

Softaken OLM to PST Converter can export complete OLM mailbox data to PST without requiring Outlook to be installed on Windows. It also preserves folder structure and metadata and supports large OLM files. You can process the required OLM files, create PST files, and then import those PSTs into the appropriate Microsoft 365 mailboxes using your preferred Microsoft 365 migration method.

This approach is useful when you want to verify the converted data before putting it into Office 365.
 
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