You could do with not using PST files at all.

I spent a year or so fixing e-mail type issues for BAE Systems and PST files were the main cause of stress in my life.

Ask whoever provides your e-mail solution, presumably your webhost if they have an Exchange Archiving Solution.

This will mean any e-mails sent/recieved are stored server side rather than an easy to corrupt data file on your PC. Server side means regular backups etc.

Tim