How do I allow some domain users to login without a password

I have a school that has all of its kids in Active Directory and of course all PC's are joined to the domain.  What we want to do is allow all kids K-4 to not have a password to login.   Can I do this per OU and if so can someone point me in the correct direction to get this accomplished?  Each grade has its own OU.  Any assistance would be greatly appreciated.  I am using a 2008 Domain controller hosting primarily XP machines with a few Windows 7 machines for about 750 nodes.  Thanks for helping!
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RTSCCFLAXAsked:
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athomsfereCommented:
Assuming your hierarchy looks like:

SchoolSystem.com
---K
---1
---2
---3
etc

Then you would need to configure the password policy for the domain as none, and then OUs 5 and up add the password policies you want.
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hunartCommented:
If it is a domain with AD, I don't believe that you can create profiles without a password.  On the other hand, you can create local users without a password.  However, if these users need access to the resources on the AD, they must provide a username and password before they can gain access.
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Mike KlineCommented:
Is your domain functional level at 2008?   If so then you can use fine grained password policies

http://blogs.technet.com/b/seanearp/archive/2007/10/06/windows-server-2008-fine-grained-password-policy-walkthrough.aspx

http://technet.microsoft.com/en-us/library/cc770842(WS.10).aspx

You can't link them to OUs but can have different password polices for groups/users  

Thanks

Mike
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hunartCommented:
Athomsfere, I believe that he wants to have "some domain users" without password.

mkline, Fine Grained Password policies do require password to log onto resources.
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Mike KlineCommented:
He could set minimum password length (msDS-MinimumPasswordLength) to 0
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RTSCCFLAXAuthor Commented:
mkline I am trying your solution right now.  I will let you know if this works!  

athomsfere  I tried your solution and it still wouldn't let me do it.  

I will post back results.

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RTSCCFLAXAuthor Commented:
mkline -- WORKED LIKE A CHARM!!!  I also found a program called Password Policy Manager which helped out a lot.  And best of all it was freeware although I am going to donate because it just saved my butt!!  You can read about it here http://www.parhelia-tools.com/products/ppm/ppm.aspx   Thanks everyone for your help now the young kids do not have to remember an 8 character password causing me to reset their password on a daily basis! :P  
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RTSCCFLAXAuthor Commented:
Thanks alot this was exactly what I was looking for!
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Mike KlineCommented:
Awesome tool, there are several good third party tools that put GUI's around Fine Grained Passwords/PSO's for 2008.

Microsoft is doing it too...but not until Windows 8 do we get the GUI   http://adisfun.blogspot.com/2011/09/windows-server-8-fine-grained-password.html

Thanks

Mike
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