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Not sure but you can give try to this <a href="https://www.lepide.com/exchange-manager/search-from-backup-and-restore.html" rel="ugc">Exchange mailbox e-discovery solution</a> to search and export mailbox to pst.<br />
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Hope his help!
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We need to search 11 PST files for 22 different keywords and export the emails to another PST file. &nbsp;We've exported the target mailboxes to PSTs from our Exchange 2007 server. &nbsp;Anyone have a recommendation for a software product that does this, or have a PowerShell script that will get the job done?
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We need to search 11 PST files for 22 different keywords and export the emails to another PST file.  We've exported the target mailboxes to PSTs from our Exchange 2007 server.  Anyone have a recommendation for a software product that does this, or have a PowerShell script that will get the job done?

Legal Discovery - Export Keywords to PST

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Export

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.