We (my wife) forwarded email from an existing Gmail POP account to a new Outlook.com POP account.

She has the referenced email account on her desktop machine and laptop.

On the desktop she filed all but 1 inbox emails to local Outlook folders leaving the 1 email in her desktop inbox.

Her laptop then showed the same condition. But that can't be since (I thought) synchronizing email between devices is an IMAP property?

Mark