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pop3 problems on a new exchange 2010 box

Migrating from old hardware to new hardware.  Single Exchange 2010 server, single site, single organization, single domain.

Right now the old exchange 2010 and the new exchange 2010 are both online.  All mailboxes and public folders have been moved over to the new exchange 2010.

I have a couple of users who still use pop mail and I can't get pop mail to work on the new exchange 2010.  I checked all the settings, made sure the service is on, tested it from inside the firewall.

When I the Test button in the mail profile setup on a workstation, configuring pop mail:

Connecting to the old server I get:  
Log onto incoming mail server (POP3) Completed

Connecting to the new server I get:
Your e-mail server rejected your user name... -ERR Command is not valid in this state.

Everything appears to be exactly the same on the 2 servers and on the ADD ACCOUNT screen on the workstation the only thing I change is the servername.
With the old server, it tests ok.
With the new server I get that error.

Any help would be greatly appreciated.

1 Solution
Patrick BogersDatacenter platform engineer LindowsCommented:

Exchange 2010 requires you to use TLS Encryption "Secure POP" for authentication to work which if your company dont work with people cannot log in.
Please follow the steps explained in this step by step and you will (propably ) be good to go.
gateguardAuthor Commented:
I followed this guide.  Thanks.  It works for the old server, not for the new server.

But I can't find anything different between the 2 servers.

On the outlook configuration screen, if I switch to the old server (leaving all the other settings untouched) pop3 works.

On the outlook configuration screen, if I switch to the new server (leaving all the other settings untouched) pop3 fails.

And I THINK I copied the settings exactly between the 2 servers.

It's a mystery.
What names do you have on the .pfx cert attached to your pop3 services on the new server? if you don't have a certificate assigned to pop3 service that could potentially be your issue
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