how to make backup of emails from my outlook web mail

Hi @Sijo Jose [PKJ International LLC]

Good day! Welcome to Q&A forum. 
I understand you're looking to back up your emails from Outlook Web Mail (Outlook on the web). While Outlook Web Mail does not offer a direct bulk export feature, there are several effective methods available depending on your account type and access.

To better assist you, could you please clarify the following:

• Are you using a personal Microsoft account or a work/school account provided by your organization?
• Are you trying to back up all emails or just specific folders or messages?
• Do you have access to the Outlook desktop application?
• Do you need the backup in a specific format?
• Is this a one-time backup or do you need a recurring solution?

In the meantime, I could recommend some steps below:

For Web Version – Outlook on the Web (OWA):

Option 1: Save individual emails manually You can save specific emails one at a time:

1. Open the email in Outlook Web Mail.
2. Click the three-dot menu (⋯) in the top-right corner.
3. Select “Print” and choose “Save as PDF”, or select “Save” to download the email as a .eml file. This method is best for archiving a small number of important messages.

For Work/School Accounts (Microsoft 365 or Exchange Online):

Option 2: Use Outlook Desktop App (Recommended for Bulk Backup) If you have access to the Outlook desktop client:

1. Open Classic Outlook and go to File > Open & Export > Import/Export.
2. Choose Export to a file > Outlook Data File (.pst).
3. Select the folders you want to back up and save the file. This method is ideal for backing up large volumes of emails efficiently.

Option 3: Organization Admins – Use eDiscovery If you're part of an organization and have admin privileges:

• Use Microsoft Purview or Exchange Admin Center to run an eDiscovery search.
• Export mailbox data to a .pst file.
• You can also apply Litigation Hold to preserve deleted items. This is suitable for enterprise-level backups or compliance needs.

For Personal Accounts (like Outlook.com, Hotmail.com):

Option 4: Use Microsoft Privacy Dashboard For a full mailbox backup:

1. Visit https://account.microsoft.com/privacy.
2. Sign in with your personal Microsoft account.
3. Go to “Download your data” and select Mail.
4. Request an archive and wait for the download link via email. This method exports your mailbox in PST format, which can be opened in Outlook desktop.

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Thank you for your cooperation. Looking forward to hearing from you.

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There is no simple solution to do that. On the web, you could use eDiscovery method, but it's fairly complicated. Lots of articles on the web about that.

Of course, if you have Office and Outlook, it's easiest way... save to .pst.

There are 3rd party tools, too. 365 backup.