Microsoft 365 - Manually Move Mail from Gmail to Microsoft 365

Before exporting your email data to a .pst file, ensure that your Gmail account is configured in Outlook. At the top of the Outlook ribbon, open the File menu and click Add account. Follow the Gmail - Configure Outlook for Windows tutorial for configuration assistance.

After your Gmail account is configured, at the top of the Outlook ribbon, open the File menu, then select Open & Export > Import/Export.

Choose Export to a file. 

Choose Outlook Data file (.pst).

Choose the root of the Gmail account, making certain the option to Include subfolders is checked and click Next.

Select a name and location for the file (the user's Desktop or Documents folders are recommended).

Click Finish, then select OK.

*Note: Password is not necessary.

At the top of the Outlook ribbon, open the File menu again and select Account Settings to remove the Gmail account. 

Select the Gmail account, then click Remove. 

Before importing the .pst file, configure your Exchange account. As you did in Step 1, open the File menu and click Add account. Follow the Microsoft 365 - Outlook for Windows Exchange Configuration tutorial for detailed configuration instructions. 

Once your Exchange account is configured, at the top of the Outlook ribbon, open the File menu, then select Open & Export > Import/Export.

Choose Import from another program or file.

Choose Outlook Data File (.pst).

Select the file just created and click Next.

Choose to Import items into the same folder in: and select the Microsoft 365 account. Click Finish.

Please note that only mail is moved. Manually moving calendar items and contacts from one service to the other is not supported.