DataVare Outlook PST Compact Expert is a fast and powerful tool that can allow you to shrink massive Outlook PST files. The program runs on all currently available Microsoft Outlook versions, including those from past iterations. Outlook 2003, 2007, 2010, 2013, 2016, 2019, and 2021, fit it as well. This application can also be used with PST files either ANSI or Unicode. This feature will help you to save email data as well as other data and concurrently shrink the PST file size. One can also try out the free edition.