How can I tell what protocol is being used between Outlook clients and my Exchange server?

Is it IMAP4, SMTP, or do I have a choice?
HilltownHealthCenterAsked:
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bmadison23Commented:
I'm not sure what version of Outlook you are using but you can try the following example with Outlook 2007

Go to Tools --> Account Settings

From this window there is a column that says "Type"  If you are using Exchange MAPI it will display Exchange.

If you are using IMAP or POP it will display either:

IMAP/SMTP or POP/SMTP.

Remember IMAP and POP are protocols to "receive" mail.  SMTP is the protocol to send mail.

Hope this helps.
Jay
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HilltownHealthCenterAuthor Commented:
This is Outlook 2003. There is no Account Settings under Tools. I checked under Options, but cannot find what you describe.

So IMAP is only used for receiving mail and SMTP is used by Outlook to send to the Exchange Server? I am trying to set up automatic encryption, and if I encrypt SMTP, users' PDAs can't get mail. So I was trying to determine if I could leave SMTP unencrypted for external PDA use, while encrypting all intra-agency Outlook email transactions. Therefore I was hoping that Outlook could be set to use IMAP (which I have set for SSL) for sending/receiving, while PDAs could use unencrypted SMTP. Maybe I need to resubmit this question, including the encryption piece?
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Mark DamenERP System ManagerCommented:
By default Outlook uses MAPI, and not either of those protocols mentioned - IMAP or SMTP.  
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HilltownHealthCenterAuthor Commented:
Can MAPI be encrypted at the server?
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bmadison23Commented:
Is the Exchange server 2007?

Look at this article:

http://www.shudnow.net/2008/02/10/client-to-server-secure-smtp-connectivity-in-exchange-server-2007/

It also has links to setup Group Policy to enforce 2003 and 2007 clients to use MAPI encryption.  By default 2003 is not encrypted and Outlook 2007 is encrypted by default.

Jay
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HilltownHealthCenterAuthor Commented:
It is Exchange Server 2003
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bmadison23Commented:
I'm not sure what the question is any more :)

From the outside Exchange can be configured to accept both SMTP and SMTP over SSL.  It's just up to the client to specify if they want to use it or not.

This MS article explains how to set it up and explains how it works.
http://support.microsoft.com/kb/823019

If you want to enforce MAPI Encryption you should set group policy to enforce it on your clients.  The info is in the link posted above.

Jay
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