Installed an update on my iPhone but it is not taking in my old passcode now

Hi,
I successfully installed an update on my iPhone and am being unable to login onto the phone. It is not accepting my old passcode and the interface has also changed. Is there a default passcode that I need to know after the installation?

Yes, the phone is for use in my company and I do have an exchange account.
I was hoping I get a mail regarding the change of passcode but havn't received one as yet. Any suggestions?
Thanks in advance.

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