Issue by email - POP3 error with Exchange 2007

Errors and Error Messages
Q. When I try to verify my connection to POP3 server, I'm getting an error: "Connection to POP3 server was not established: Command "USER" failed : -ERR Command is not valid in this state.." I'm using MS Exchange 2007.

A. Open your Exchange Shell and enter:

Set-PopSettings -LoginType PlainTextLogin

 Then restart the POP3 service.