I have been using MS Outlook for a long time, and my PST file has grown quite large. Recently, I noticed Outlook has become very slow — it takes a long time to open, search emails, and sometimes even freezes. I suspect the oversized PST file might be the reason for these performance issues. Can anyone explain how large PST files affect Outlook performance? Also, what are the best methods or tools to reduce or manage PST file size without losing data?