You can use Aryson Outlook PST Compress Tool to compress your PST files in Mac.  This software is highly secure that reduce the size of your PST files without needing to install the MS Outlook on your system. When your PST files size becomes too large then it s very difficult to open with MS Outlook, this tool can easily compact or compress the files. The users can select single or multiple PST files at once. Additionally, you can remove the attachemnts from ther PST files to reduce the size. This tool is compatible with all versions of the Windows OS. 

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If you are looking for the best and most reliable tool to compress PST files then I will recommend you to use the MacSonik PST Compress and Compact for Mac. It is the very best tool that quickly compresses Outlook PST files. This software is 100% safe and risk-free -and it also gives you the option to reduce PST file size in batch with zero data alteration. The best thing about this software is that it supports all the Outlook PST files made on MS Outlook 2021, 2019, 2013, 2010, and all the below versions.