Enable Pop on Exchange Server 2007
We have just finished our Exchange 2007 server migration and it went rather well, however there where a few things that I thought I would share that had me stumped for a while.
So Exchange 07 doesn’t initialise Pop by default, while you will see all accounts will be enabled for Pop by default, but the pop service must be started
there are 2 ways of doing this 
1. through the GUI
or
2. Through powershell
Seems like powershell is the best method, why? Simply because exchange 07 relies heavily on powershell so its a good place to familiarise yourself if you haven’t started already.
through the GUI
start > run type ’services.msc’ > find ‘Microsoft Exchange POP3′ and start this
You will also want to change it from manual to Automatic if you have server 08 you may also want to change this to auto (delayed start) I have done this as Pop is not as vital as other services on the exchange.
Through powershell – Exchange console (recommenced)
set-service msExchangePOP3 -startuptype automatic
start-service -service msExchangePOP3
No that should be about it, your ready to go that’s not so hard at all.
BUT if you have configured this and you are getting the authentication box constantly popup as if its not authenticating then your not finished read on:
First this is first go to the mailbox and ensure that the mailbox has POP enabled.
through the GUI
Recipient Configuration > Mailbox > find your mail box and then right click properties > Mailbox features you can enabled and disable here
Through Console
set-CASMailbox -Identity MailboxNameHere -popEnabled $true
If this is enabled then your authentication is set incorrectly.
"Under a default Exchange 2007 installation, IMAP and POP3 only work when the connection from the client is secured. For many organizations, this is not a desirable configuration."
We must allow for allow plain text logins
this can only be done as far as I know through the console using the below command
Set-PopSettings -LoginType PlainTextLogin
Now for this to take effect you must restart your ‘Microsoft Exchange POP3′ Service.
Now you can enjoy pop again.
