Deleting Emails from an IMAP Server While Keeping Them in Outlook
If your mailbox is running out of space, you can move emails off the server and keep them safely stored on your computer in Outlook.
This works by copying emails into a local Outlook data file (.pst) and then removing them from the server.
Step 1: Create a Local Archive (PST file)
- Open Outlook
- Go to File → Account Settings → Account Settings
- Click the Data Files tab
- Click Add and create a new Outlook Data File (.pst)
- Name it something like Local Archive
Step 2: Move Emails to Your Local Archive
- Select your Inbox (or any IMAP folder)
- Press Ctrl + A to select all emails
- Drag them into your Local Archive folder
Repeat for any folders you want to keep.
👉 Important:
Emails in this folder are now stored only on your computer, not the server.
Step 3: Check Everything Copied Correctly
Before deleting anything:
- Open a few emails in the Local Archive
- Make sure attachments and content load properly
Step 4: Delete Emails from the Server
- Go back to your IMAP Inbox
- Select emails and press Delete
This removes them from:
- Outlook
- Webmail
- All synced devices
Step 5: Back Up Your Archive (Strongly Recommended)
Your local archive is not synced anywhere.
To protect it:
- Go to File → Open & Export → Import/Export
- Export to .pst file
- Save a copy somewhere safe (external drive or cloud)
Important Notes
- IMAP always stores emails on the server
- Outlook uses a cache file (OST), not a backup
- Only a PST file gives you full local control and backup
Conclusion
This method lets you:
- Free up server space
- Keep full access to your emails in Outlook
- Stay in control of your data
Just remember:
once emails are removed from the server, your local file becomes the only copy.
