To start the POP3 services: On the computer running the Client Access server role, click Start, point to Programs, point to Administrative Tools, and then click Services. Right-click Microsoft Exchange POP3, and then click Start.
Â On the computer running the Client Access server role: In the Services snap-in, in the console tree, click Services (Local). In the result pane, right-click Microsoft Exchange IMAP4, and then click Properties. On the General tab, under Startup type, select Automatic, and then click Apply.