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Definition
💡 Email migration is the process of moving your email, and usually your contacts and calendar too, from one email account or provider to another. There could be many reasons for this: switching jobs and losing access to the old company account once you’re offboarded. Switching providers because you’re closing the old one. Consolidating years of history into a new address because the old one is going away.
Why moving your mail is never as simple as copy-paste
You'd think moving email would be simple. Copy the files, paste them somewhere else, done. It's not quite that clean.
The real complexity is that email isn't just messages. It's folders, labels, read and unread status, sometimes years of organizational structure you built without thinking about it. A real migration tries to preserve as much of that as possible. A lazy one just dumps everything into one giant unsorted folder and calls it done. You'll know pretty quickly which kind you got.
This matters most when you're switching providers entirely (Yahoo to Gmail, say) rather than just adding a second account. Losing years of searchable history because a migration went sideways is a genuinely bad day.
Full migration, manual migration, and the forwarding shortcut that isn't one
Full migration moves everything: mail, folders, contacts, sometimes calendar events, using your old account's IMAP or POP3 access to pull the data across.
Manual migration is what it sounds like: dragging specific folders or messages over by hand, usually because you only need certain things, not your entire archive.
Forwarding isn't really migration at all, even though people call it that sometimes. Setting up auto-forward from an old account to a new one keeps new mail flowing, but it does nothing for your existing history. If you need the old stuff too, forwarding alone won't cut it.
How to migrate your email
In Gmail:
- Open Gmail on your computer, click the gear icon, then "See all settings."
- Go to the "Accounts and Import" tab.
- Click "Import mail and contacts" and follow the on-screen steps. Google's own import guide covers troubleshooting if it stalls.
- Your other account needs POP access turned on for this to work; check its settings first if the import fails.
In Outlook:
- Go to File > Open & Export > Import/Export.
- Select "Import from another program or file," then choose "Outlook Data File (.pst)."
- Browse to the .pst file you exported from your old account, and follow the prompts. Microsoft's import guide has the full walkthrough.
- Note that new Outlook doesn't currently support .pst import; you'll need classic Outlook for this step.
What actually goes wrong in a migration, and how to dodge it
Back up before you start, always. Export a copy of anything irreplaceable before you begin any migration process. This is non-negotiable.
Check storage limits on the destination account first. A migration that stalls halfway through because you hit a storage cap is a mess to untangle afterward.
Expect folders and labels to translate imperfectly. Gmail labels don't map one-to-one onto Outlook folders, or vice versa. Some manual cleanup afterward is normal, not a sign something went wrong.
Ask yourself if you actually need to migrate at all. If the real goal is just managing multiple accounts without losing your mind, connecting them in one client instead of migrating might be the simpler, safer answer.