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If your work email is exchange, your company probably has a policy that requires a PIN. This can be enforced by an exchange host (at one point, 1and1 hosting was supposedly doing this to customers on hosted exchange accounts). If it's policy, there is nothing you can do. Hard reset will "fix" it, but you will lose your contacts from your phone (not your exchange account, though), but the moment you set up your exchange account again you'll have to start using a PIN again.
If it's not exchange, I have no idea. Either way, ask your IT folks about it.
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