Smaller PST files? Seriously?
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PSTCompactor can reduce the space consumed by your PST files across the network by compressing emails, removing deleted content and forcing the PST file to 'compact' - the only way PST's physically reduce in size.

Our Enterprise edition adds powerful content management capabilities, making it possible to identify and remove non-business related emails previously outside the System Administrator's reach.

Your PST files remain 100% Outlook compatible - no need to install client side software and no need to make any changes to your Exchange server.