I'm using MS Outlook 2007 in my office. I need to compress the size of my PST files. I have three big PST files due to which I'm facing problem. Sometimes my system hangs while using MS Outlook. Someone asked me to delete the unwanted messages from my files but I can't do so as all are important. What I'm looking for is a safe way or method to compress my PST files. May you help me in this issue? Thanks in advance.