Data Backup Problems

How to Download and Back Up Microsoft 365 Outlook Emails

Amos Gikunda Oct 7, 2026 868 views

Question details

The user wants to know how to securely download and back up their Microsoft 365 Outlook emails for long-term offline record keeping.

How to Download and Back Up Microsoft 365 Outlook Emails

Product: Microsoft 365 Outlook
Device & OS: not provided
Scenario: Creating long-term offline backups of important email records, such as invoices and tax documents, to local storage.
Observed behavior: Emails are stored in the cloud mailbox service and not automatically saved to OneDrive, requiring a manual local backup workflow using a desktop client.

Before you start

Ensure you have the classic Outlook desktop application installed, as Outlook on the web does not support exporting local PST data files.

Solution 1Recommended

Export Emails to a PST File Using Classic Outlook

The most reliable method to back up Microsoft 365 emails is using the Import/Export feature in the classic Outlook desktop client to create a local PST file.

PST (Personal Storage Table) files are associated primarily with accounts configured in classic Outlook. They allow you to store your messages, contacts, and calendar data securely on your local hard drive.

Open the Import and Export Wizard

Launch the classic Outlook desktop application. Click on 'File' in the top-left corner, select 'Open & Export' from the left sidebar, and then click on 'Import/Export'.

Select the Export Action

In the Import and Export Wizard, select 'Export to a file' from the list of actions and click 'Next'.

Choose the File Type

Select 'Outlook Data File (.pst)' as the file type you want to create and click 'Next'.

Select the Mailbox Folder to Back Up

Choose the email account or specific folder you want to back up. Make sure the 'Include subfolders' checkbox is ticked to export everything, then click 'Next'.

Save the Backup File

Click 'Browse' to choose a secure location on your computer to save the PST file. Name the file, click 'Finish', and optionally enter a password to protect your backup.

Export Emails to a PST File Using Classic Outlook

Backup Complete: Your emails are now safely stored offline. Keep this PST file in a secure location or back it up to an external drive for long-term retention.

Solution 2

Use a Supported Third-Party Email Client

If classic Outlook is not included with your Microsoft 365 subscription, you can use a supported third-party desktop email client to download your mailbox data locally.

Free Microsoft Office alternative

Manage Your Exported Documents and Attachments with WPS Office

While backing up your Microsoft 365 Outlook emails for long-term retention, you likely have important attachments like invoices and tax documents. WPS Office is a free, lightweight suite that helps you open, edit, and organize these files seamlessly without requiring an expensive subscription.

1. Download WPS Office: Visit the official WPS Office website and download the free installer for your operating system.
2. Install the Software: Run the downloaded installer and follow the simple on-screen instructions to set up the suite on your computer.
3. Open Your Attachments: Locate the documents or spreadsheets you saved from your email backups, right-click, and open them instantly with WPS Office.

Fully compatible with Microsoft Office formats like Word, Excel, and PowerPoint.Lightweight and fast, opening your exported email attachments in seconds.Built-in robust PDF tools to efficiently manage tax documents and invoices.Familiar user interface requiring no learning curve for Microsoft Office users.

Frequently Asked Questions

Can I back up Microsoft 365 emails using Outlook on the web?

No, Outlook on the web does not provide a local data-file workflow. You cannot export or save local PST or OST files directly from the web browser. You must use a desktop email client such as classic Outlook.

Are Microsoft 365 emails automatically backed up to my OneDrive?

No, Microsoft 365 email is stored in the dedicated mailbox service and is not normally saved in a OneDrive folder. To keep offline copies, you must manually export them to a local drive or use an approved backup solution.

What is a PST file and why do I need it?

A PST (Personal Storage Table) file is an Outlook Data File used by classic Outlook for Windows. It is essential for storing local, offline copies of your email messages, calendar events, and contacts for long-term record keeping.

How can I view my emails after I back them up to a PST file?

To view the contents of a PST file later, you need to open it in classic Outlook by navigating to File > Open & Export > Open Outlook Data File, and selecting your saved PST backup.

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