email archiving storage methods

Hi
Lately i have been running into a few users who archive a boat load of emails. these emails often contains jpeg attachments as well as others. The problem is that their pst fles grow rapidly and before you know it they become corrupt. Our company currently consists of about 70 users. My question is: how can i address the issue of pst files growing extremely large (thus becoming unstable)? Ideally i would like to identify potentially problematic pst files before they become corrupt. I am also curious to know how other IT administrators are handling this job…

Thank You.