Apparently 4.3.3 broke my exchange password authentication and is locking my work computer.  Can I restore previos IOS?

Any help will be appreciated. I upgraded to 4.3.3 and it apparently broke the password authentication for my work exchange account. I can't get my iCal on my desktop after Lion and now this. Grrr. It continues to hit the server and locks me out so I can't get email from any computer. Does anyone have a fix? If not can I restore the previous version? It was working perfect.
Thanks in advance.

As far as I know, it is not possible to downgrade to a previous iOS. Apple doesn't support it.

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