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POP3 Not Working Connecting To Exchange 2010

Migrated a client to a new Exchange 2010. One of the clients still using POP3. I enable the MS Exchange POP3 service. Made sure all settings are OK in client configuration but still would not work. I have it set to plain text (I know security risk) but when I telnet to the server on port 110 that worked but when I entered USER username it gave error:

POP3 ERR Command is not valid in this state

Found this article that fixed the issue

Basically had to do the following:

 1. Log into your Exchange 2010 CAS server
 2. Open the Exchange Management Shell
 3. Issue command Set-PopSettings -LoginType PlainTextLogin
 4. Restart the Exchange POP Service

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