Manual export and import vs. IMAP migration

For a single mailbox you can export a PST/MBOX with Outlook or Thunderbird and import it into the new account. Across several accounts that means work on every computer, huge files and missed folders. IMAP migration runs server to server.

IMAP MigratorManual export/import
Where it runsServer to serverOn each user's computer
Several accountsIn parallel, from one placeOne by one, by hand
InterruptionsContinues where it stoppedUsually start over
Read status and datesKeptDepends on the tool
CutoverKeeps syncing new mail until MX switchesMail that arrives later needs another pass

When IMAP Migrator fits better

  • There is more than one mailbox
  • Mail keeps arriving during the move

When Manual export/import fits better

  • You want an offline archive of a single small mailbox

Questions

I already have a PST or MBOX file. Can I upload it?

Yes. File import uploads a PST or MBOX file straight into a mailbox.

Product names belong to their owners. This comparison describes general approaches and may not reflect every edition or option.