how do i disable users from creating pop accounts in Exchange 2010?

Some folks are using Outlook 2010 at the office to access there personal pop accounts.  How can I disable that feature for everyone?  Please be as specific as possible.

All of us are using Outlook 2010, Exchange Server 2010, Active Directory and Windows Server 2008-R2.

Thanks for your help.
WeThePeopleAsked:
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Stelian StanConnect With a Mentor Network AdministratorCommented:
To disable it for all current mailboxes:

Get-Mailbox | Set-CASMailbox -PopEnabled $false

I am not aware of any way to set this as the default setting for new mailboxes.\
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kevinhsiehCommented:
You can block outbound TCP 110 and TCP 995 at the firewall. TCP 110 is the standard POP3 service. TCP port 995 is the standard for running POP3 over TLS (SSL).
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WeThePeopleAuthor Commented:
I am unfamiliar with the statement:
Get-Mailbox | Set-CASMailbox -PopEnabled $false
Where do I go to type that in?


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ManicDConnect With a Mentor Commented:
Get-Mailbox | Set-CASMailbox -PopEnabled $false

should be typed in the Exchange Management SHELL (Command Prompt for exchange 2010).

This can normally be found in the All Programs Menu
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WeThePeopleAuthor Commented:
I understand Kevin's method however, I just realized that two people are on our network and operate outside of Exchange 2010.

I still want to stop all Exchange 2010 users from installing pop3 accounts in Outlook 2010.

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WeThePeopleAuthor Commented:
I just found the program Exchange Management SHELL (Command Prompt for exchange 2010).

i opened it and its has a black screen with the words
[PS] c:\Windows\System32>
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WeThePeopleAuthor Commented:
Okay.  I executed the command in Exchange Management Shell.

Is there a way to test if it worked?
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kevinhsiehCommented:
Isn't the accepted solution how to prevent Exchange 2010 Users from accessing their Exchange mailbox via POP3? That's not the question, as I understand it. The problem, as I understand it, is that Outlook users are using POP3 to access offsite email accounts. That has nothing to do with Exchange. It's an Outlook/networking/firewall problem.
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