I want to upgrade to ios 5, succeeded, but the itunes asking me for password to restore my backup, i tried all sorts of possible password and it can't. and now i am not able to retrieve my backup. i have lots of impt data inside! what should i do?

Anyone please help me asap. really super urgent!

There are two ways that a backup can become encrypted:
You chose to encrypt it, then forgot the password.
If you have company-provided MS Exchange access your IT department has the option of requiring your backup to be encrypted. The first time you backed up or synced after installing MS Exchange you were prompted for a password. That is the password you need.
If you don't have the password any longer there is no way to restore the backup.

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