How to import PST files to Microsoft 365

How to import PST files to Microsoft 365

This article describes how to import a PST file into a Microsoft 365 mailbox.


  • Applies to: Cloud Office Administrator
  • Difficulty: Moderate
  • Tools required: Microsoft Outlook

NOTE: Importing PST files into a mailbox requires the desktop version of Microsoft Outlook on Windows. If you have not yet configured your Microsoft 365 mailbox in Microsoft Outlook, see Set up your Microsoft 365 Exchange Online mailbox in Outlook for Windows for configuration steps.

For more information about prerequisite terminology, see Cloud Office support terminology.

Importing PST files to Microsoft 365

Step 1. Open Microsoft Outlook with your Microsoft 365 mailbox profile.

Step 2. At the top of the Outlook ribbon, select File.


Step 3. Select Open & Export >> Import/Export. This will open the Import/Export wizard.

Open Export and then import export

Step 4. Select Import from another program or file, and then click Next.

Import from another program

Step 5. Select Outlook Data File (.pst) and click Next.

Outlook Datafile

Step 6. Click Browse to search for the .pst file you want to import. Under Options, choose how you want to handle duplicate items, then click Next.

Browse options

Step 7. Make sure the checkbox for include subfolders is checked and the Import items into the same folder in: is selected, with your mailbox selected in the drop-down menu.

Import items into same folder

Step 8. Click Finish. Outlook will begin importing the contents of your PST file. This process can take anywhere from a few seconds to a few hours depending on the size of the PST file.

How to import a .pst file into a Microsoft 365 mailbox using Microsoft Outlook

{{< youtube w-DTWtGHspQ >}}