| Step 1: Open outlook and left click on "File” |
| Step 2: Left click on "Account Settings” |
| Step 3: Left click on "Change " |
| Step 4: Left click on "More Settings" |
| Step 5: Left click on "Advanced" |
| Step 6: Left click on "Security" |
| Step 7: Left click on "Connection" |
| Step 8: Left click on "Exchange Proxy Settings" |
| Step 9: Left click on "On fast networks, connect using HTTP first, then connect using TCP/IP" in "Microsoft Exchange Proxy Settings" |
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| Step 10: Left click on "OK” in "Microsoft Exchange Proxy Settings" |
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| Step 11: Left click on "OK” in "Microsoft Exchange" |
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| Step 12: Left click on "OK" |
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| Step 13: Left click on "Next" in "Change Account" |
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| Step 14: Left click on "Finish" in "Change Account" |
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| Step 15: Left click on "Close" in "Account Settings" |
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| Step 16: Restart Outlook. |
| Step 17: Right click on "Microsoft Outlook (push button)" while holding down CTRL |
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| Step 18: Left click on "Connection Status" |
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| Step 19: Verify the connection is made via HTTPS |
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Use a custom ADM file to push this setting to all clients via group policies:
http://support.microsoft.com/kb/961112