If you want to remove attachments from the PST file. So you can use MailsDaddy PST Attachment Extractor Tool. It is very easy to use this tool. Extracts attachments from PST files in just a few clicks. This tool does not cause any harm to the data. And also supports all MS Outlook 2019,2016,2013,2010,2007 etc versions. This tool is compatible with all Windows 7,8,10, XP, etc.
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https://www.mailsdaddy.com/blogs/free-method-extract-attachments-pst-file/
https://www.mailsdaddy.com/pst-attachment-extractor/