Currently Being ModeratedJun 30, 2012 4:25 PM (in response to lynnlondon)
A POP account is not synchronized with the server. Although it is possible to access a POP account with more than one email client, a POP account is designed to be accessed with a single email client only. A POP account is an antiquated account type - became available when most people had access to a single computer only.
Your Gmail account syncs perfectly because you are accessing the account as an IMAP account with both email clients, which is designed for this.