Enable "Allow inheritable permissions from the parent..." for all exchange users in domain

Since last summer i am responsible for out Exchange 2003 Server within our company (with about 400 exchange users).
I don't know why, but the former admin has disabled the option "Allow inheritable permissions from the parent..." in the Advanced Security Settings for more than 300 account.
Because of that, many features and scripts are not working as they should.
Is there a way (maybe with a script) to enable the option on all accounts at one time?
Thanks in advance...
christianbockAsked:
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mikemsdCommented:
You should be able to accomplish this with ADModify.net. It is a utility that allows for bulk editing of settings related to Active Directory and Exchange. I would use it with care however because bulk changes can come back and bite you if not careful. The good thing is that it does keep a log of changes so you can roll them back if necessary, however I wouldn't trust that solely, and would make a backup first:

http://www.codeplex.com/admodify
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