Cannot Connect to Mail Exchange Server Today

I updated to 10.6.4 last night. This morning I cannot access my email from my Mac from my company Exchange Server. I can do so from my iPhone. I assume something went wrong with the update--don't know. I have had the IT guy here at my computer this morning and he cannot figure out what is wrong. He tried to set up an Exchange email account for his own account from my computer but that failed also. Any ideas?

The problem has been corrected when our IT guy reset the IIS Admin Service on the Exchange Server.

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