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Enable Proxied IMAPv4 in Exchange 2003 Network

You have a network with multiple Exchange 2003 servers and you want to configure a front-end (FE) server as the main “IMAP server” for your users.

Solution

This is actually a bit of work. You need to do the following:

  • Enable IMAPv4 on all of your mailstore back-end (BE) Exchange servers. Ensure the IMAPv4 service will start on boot.
  • Configure SSL on the FE IMAPv4 instance.
  • Do not enable SSL on the BE IMAPv4 instances.
  • Configure your FE server (usually your OWA server) as a “front-end” server.

At this point, you should be able to test your connectivity.

Testing the Connection

Let’s test the IMAPv4 connection using telnet first before we enable SSL. This will make our lives much easier since we’ll know if we have it setup before the complication of SSL.

Following is an example of a failed connection. We did connect to the FE server (owa2003-test.XYZ123.ABC123.local) and our login worked but the BE didn’t have IMAPv4 running in this case.

* OK Microsoft Exchange Server 2003 IMAP4rev1 server version 6.5.7226.0 (owa2003-test.XYZ123.ABC123.local) ready.
01 capability
* CAPABILITY IMAP4 IMAP4rev1 IDLE LOGIN-REFERRALS MAILBOX-REFERRALS NAMESPACE LITERAL+ UIDPLUS CHILDREN
01 OK CAPABILITY completed.
02 login puryear-test-ad@STU123.ABC123.local test12345
02 NO No connection could be made because the target machine actively refused it

Here we have enabled IMAPv4 on the BE server that has our mail and we are able to login:

* OK Microsoft Exchange Server 2003 IMAP4rev1 server version 6.5.7226.0 (owa2003-test.XYZ123.ABC123.local) ready.
01 capability
* CAPABILITY IMAP4 IMAP4rev1 IDLE LOGIN-REFERRALS MAILBOX-REFERRALS NAMESPACE LITERAL+ UIDPLUS CHILDREN
01 OK CAPABILITY completed.
02 login puryear-test-ad@STU123.ABC123.local test12345
02 OK LOGIN completed.

 

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