To make sure all of your email is downloaded to your computer in Outlook, you’ll want to check two things:
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How your email account is set up (IMAP vs POP3 vs Exchange/365)
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Your Outlook sync/download settings
🔹 Step 1: Confirm Your Account Type
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POP3 → Emails are downloaded to your computer and (optionally) deleted from the server. This guarantees everything is local.
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IMAP / Exchange / Office 365 → By default, Outlook only caches a portion of your mailbox (especially with Exchange/365). Messages remain on the server unless you adjust offline settings.
👉 To check:
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In Outlook, go to File → Account Settings → Account Settings → Email tab.
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Look under Type to see if it’s POP/IMAP/Exchange.
🔹 Step 2: Adjust Download Settings
If your account is Exchange or Office 365
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Go to File → Account Settings → Account Settings.
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Select your email account and click Change.
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Find Mail to keep offline slider.
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Move it to All so Outlook downloads your entire mailbox (not just recent months).
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Click Next → Finish → Restart Outlook.
If your account is IMAP
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By default, Outlook caches headers and mail content.
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To ensure full messages are downloaded:
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Go to File → Options → Advanced.
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Under Send/Receive → Send/Receive… → Edit your account.
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Check Download complete items including attachments for IMAP folders.
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Ensure all folders you care about are checked for syncing.
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If your account is POP3
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POP3 already downloads all mail to your computer.
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To keep copies on the server too:
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Go to File → Account Settings → Account Settings → More Settings → Advanced.
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Check Leave a copy of messages on the server (optional).
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🔹 Step 3: Verify Storage
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Check that your Outlook Data File (.ost or .pst) is being created locally:
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Go to File → Account Settings → Data Files.
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Note the path and ensure it’s backed up.
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