have exchange 2010 with mailbox and cas servers, how do I modify the allowed attachment extensions?

trying to send a pst file (between internal  users) that outlook is blocking. the tids I found mention editing the workstation registry or powershell commands to change properties of an edge server (don't have that). is there a better way to modify the allowed extensions of attachments?
boblowderAsked:
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VB ITSSpecialist ConsultantCommented:
It's generally easier to just compress (i.e. ZIP) the PST file and then send it. It'll reduce the overall size of the file, preventing it from being potentially rejected due to email size limits, and it also means there's no real need to mess around with your Exchange/Outlook settings. If you're set on modifying the security settings for each user then you can follow this MS article to allow the .pst extension: http://support.microsoft.com/kb/829982
The Advanced troubleshooting section is probably the section that will interest you the most.
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boblowderAuthor Commented:
definitely don't want to be modifying the user registry, was hoping there was a server side setting instead of client in case it comes up with other file extensions.
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VB ITSSpecialist ConsultantCommented:
Is there a particular reason why the users can't zip the PST file then send it? As stated previously, it's a lot easier overall as it doesn't actually require you to make any changes on your end. Windows has a built in compression utility as well so there's also no need to install any additional software.
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boblowderAuthor Commented:
more of a whine factor (why can't I just send/read this?). why is the pst extension a problem for outlook?
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VB ITSSpecialist ConsultantCommented:
Microsoft's reasoning is that they can be used to introduce a virus onto your computer, which makes sense as a PST file could very easily contain an email message with a virus. If you want, you can look at deploying the registry key via Group Policy Preferences (introduced in Server 2008) to allow .PST file attachments. If you still have XP machines on your network, you'll need to install this update to allow the Group Policy Preference Client Side Extensions to work: http://www.microsoft.com/en-au/download/details.aspx?id=3628
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boblowderAuthor Commented:
not worth that much trouble, thanks for the info anyway.
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VB ITSSpecialist ConsultantCommented:
Not a problem, glad I could help.
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