To export an Office 365 mailbox to PST format, you can use the manual method through Outlook or Microsoft eDiscovery, depending on your access level.
If the Office 365 account is configured in Outlook, follow these steps:
- Open Microsoft Outlook.
- Go to File.
- Click Open & Export.
- Select Import/Export.
- Choose Export to a file.
- Select Outlook Data File (.pst).
- Choose the Office 365 mailbox or required folders.
- Select a location to save the PST file.
- Click Finish to start the export.
This method works well for a single mailbox, but it can take time if the mailbox is large. Also, manual export may not be suitable for bulk mailbox backup or advanced migration work.
After exporting the Office 365 mailbox into PST format, if you need to convert that PST file into another format like EML, MBOX, MSG, NSF, or other email file types, you can use
WholeClear PST Converter. It helps manage and convert PST files safely without changing the original mailbox data.
So the simple process is:
Office 365 mailbox → Export to PST → Convert PST if needed
For basic backup, Outlook export is enough. For further migration or file conversion, a PST converter tool is more useful.