subscribing all users to all folders

[Gerard <gerard.cluster@xxxxxxxxx>]

I have a system with about 20k users and I need to subscribe all of those users to all of the folders that they have ever created. I was thinking about scripting this by generating a mailbox list and echoing the folders per user to the .sub file. This seems like it could provide some unexpected results. I was wondering if there is an cleaner way to handle this. 
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