10-24-2025, 03:26 PM
My Outlook PST file has become very large, and it is starting to slow down my Outlook performance. I have already archived old emails, but the file size is still too big. I am looking for the best and most reliable tool to compress oversized PST files without losing any data or folder structure. Has anyone used a good PST compression tool that actually works efficiently with Outlook 2019 or 2021? Please share your recommendations and, if possible, a step-by-step solution or method to reduce the PST size safely.