Here’s What You Can Expect
If you use IMAP on Outlook, Mac Mail, or another mail app, you won’t notice any changes. Your emails, folders, and settings will all stay the same.
POP3 users:
If your email is set up using POP3 and you’ve enabled “Leave a copy of messages on the server”, your emails may download again after the upgrade. This is normal and happens because POP3 does not track previously downloaded messages when a mailbox is moved to a new platform.
To avoid this, we recommend switching to IMAP, which keeps everything in sync.
