Compact Outlook PST File with Powerful PST Compression a utility - PST Compress. Software will compress outlook pst files and compact PST files. PST Compress software will allow users to compress multiple PST files at a time. PST Compress, a power fil PST compaction tool Software will reduce the size of Outlook pst files. Using PST Compress software, users can extract and save all the attachments in a zipped format. SysTools PST Compress 2.0 software is now available for download with free of cost & a test drive. Demo version of PST Compaction software will save only first 10 items of every mail folders.