Searching for a Convenient PST Compact Tool? If yes, then your search ends here. Use the MacSonik PST Compress Tool. The software is capable of compressing Outlook PST files. It provides an option to preview mailbox items, which allows users to view the emails along with the attachments of PST files. This tool gives you a Date Range Filter option that helps users compress selective emails between two dates. The free demo version of this tool allows users to compress and compact 50 PST files per folder to analyze the performance and functionality.