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Outlook to Exchange Protocol

Posted on 2011-03-10
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Last Modified: 2012-05-11
Does anyone know what protocol exchange uses to connect to exchange?   Is it an ssl connection?  Thanks.
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Question by:NYGiantsFan
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Glen Knight earned 250 total points
ID: 35099165
Depends which version of Exchange and how you are connecting.

It uses RPC from inside your network.

From outside your network it would use RPC-HTTPS
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by:janvanderwijk
ID: 35099307
Usually Outlook uses imap to communicate to Exchange. But with the newer versions of Exchange / Outlook, it can also use a secure imap, imap4rev1. That one is secured by ssl. Imap uses port 143 and imaprev1 uses 993.
You can however use pop3 / smtp in Outlook, but by default it uses imap.
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by:Glen Knight
ID: 35099311
Outlook does not use IMAP to connect to an Exchange Server! IMAP isn't even enabled by default with any version of Exchange.  Neither is POP3!
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by:janvanderwijk
janvanderwijk earned 125 total points
ID: 35099584
HTTPS is a protocol, i agree, but RPC is'n quite a protocol isn't it?
What protocol does an RPC use, do you think....
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by:Glen Knight
Glen Knight earned 250 total points
ID: 35099620
No, you are right, the protocol in use is a mixture of TCP/IP, NETBIOS, NETBIOS over TCP/IP or IPX/SPX depending on the versions in use and the network circumstances.

However, outlook still uses RPC, over a mixture of these protocols.

It most certainly does not use IMAP, POP3 or SMTP when connecting to an Exchange Server.
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by:Akhater
Akhater earned 125 total points
ID: 35101200
I totally backup Demazter Outlook (when configured with exchange account of course) does not use IMAp/POP3 or SMTP it uses MAPI protocol (or MAPI over RPC)


From outside the company you have the choice of connecting through a VPN connection or using outlook anywhere through HTTPS
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