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Here is what you need:

• Exchange 2003 SP2 setup and fully functional.
• Administrator access to both Front-end and Back-end servers
• Firewall Administrator Access to your incoming firewall
• And an iPhone with Wifi access (for initial sync and testing)

Setup Exchange 2003 for IMAP4 (incoming emails to your iPhone)

1. Go into Exchange System Manager. Expand to Administrative Groups –> GroupName –> Servers –> Exchange_server_2003 –> Protocols –> IMAP4.
2. Create a new IMAP4 Virtual Server. New –> IMAP4 Virtual Server…
3. Give it a name
4. Assign IP to “AllUnassigned“
5. A new IMAP4 Server should be assigned in the right pane. Right click on it, and go into properties.
6. Leave General tab as is. (unless you want to change the default TCP ports of 143 and SSL port of 993)
7. In Access tab, click on “Authentication…” button. If you want to use SSL or have Weboutlook going into SSL automatically, then you do not need the “Requires SSL/TLS encryption” button. Otherwise, you need to check box it. Otherwise your password will be going thru cleartext!!
8. Okay, and get out of this window.
9. Repeat the same steps on your backend server.

Setup Exchange 2003 for SMTP (outgoing emails from your iPhone)

1. Go into Exchange System Manager. Expand to Administrative Groups –> GroupName –> Servers –> Exchange_server_2003 –> Protocols –> SMTP.
2. Create a new SMTP Virtual Server. New –> SMTP Virtual Server…
3. Give it a name
4. Assign IP to “AllUnassigned“
5. A new SMTP Server should be assigned in the right pane. Right click on it, and go into properties.
6. Leave General tab as is. (unless you wnat to change the default TCP port of 25)
7. In Access tab, click on “Authentication…” button. It should look like below
   
8. Click on the “Users” button and add the appropriate mobile users who will have an iPhone that will be sending. Make sure you only include those you want to be able to send. !!!Otherwise, you will have a nice open SMTP server for all the spammers to spam if you put “everyone”!!! Click OK and OK when you are done with the users and Authentication.
9. Skip Messages Tab
10. Click on “Delivery tab” and on “Advanced” button
11. If this Exchange server you are setting up is a front-end server, you will want to fill the Smart host field with your Back-end Server or whatever server processes your outgoing SMTP requests. If your Back-end server has an IP address of 172.16.62.5, put the IP address in a square bracket. Ie. [172.16.62.5] Click on OK when you are done.
12. You do not need to do this on your back-end server if your back-end server is sending the outgoing emails.

Firewall:
Depending on what firewall you have: Cisco Pix, Nokia checkpoint, etc. you’ll need to open the following TCP ports to the front-end Exchange server to the world.

• IMAP4 (ie 143)
• SMTP (ie. 25)
• SSL IMAP4 (ie.993)

Exchange Services:

• You need to set “Microsoft Exchange IMAP4″ Service to Automatic and Start the service.
• You need to set “Microsoft Exchange SMTP” Service to Automatic and Start the service. (if it isn’t already)

Apple iPhone:
I would recommend putting your iPhone onto a wifi network instead of EDGE until you get this up. Edge works fine on updates, but

1. Go into the main Springboard page (With all the icons)
2. Tap Settings
3. Tap Mail
4. Tap Other
5. Tap Exchange
6. Fill in the Name, Email address and a brief description of your work email
7. In the Incoming Mail Server
   Fill in the Host Name of your Weboutlook server. (Ie. owa.testserver.com)
8. Fill in the Username with your domain and username. (IE. TESTDOMAIN\USERNAME)
9. Fill in your password
10. In the Outgoing Mail Server
11. Fill in the Host Name of your Weboutlook server. (Ie. owa.testserver.com)
12. Fill in the Username with your domain and username. (IE. TESTDOMAIN\USERNAME)
13. Fill in your password
14. Tap Save and it should say “Verifying Exchange account information” on top.
15. The screen should go back to your Mail screen, and you are set.
16. Go into Mail and you will see your email box in the account tab all the way on top.

Troubleshooting

• Make sure your firewall to IMAP4 and SMTP is open. You can usually check this if you do the telnet test via command line (ie. telnet owa.testserver.com 143). You should see a “* OK Microsoft Exchange Server 2003 IMAP4rev1 server…” reply . Just make sure you are testing this from outside your network.
• Make sure your webaddress, username and password and tapped correctly. The iPhone is notorious for mistyping extra long passwords.

Final Thoughts:
I hope this How-to is a good starter for your IT people to get you started on the IMAP4 syncing on the iPhone. I have used it at my workplace many a times to answer emails and no one can tell you are replying via an iPhone. Please leave comments or suggestions if there are any typographic errors or anything I missed

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