Microsoft Exchange Server 2016 PowerShell Cookbook - Fourth Edition

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To determine which users are currently on litigation hold, who put them on hold, and when, use the following cmdlet:

    Get-Mailbox -Filter {LitigationHoldEnabled -eq $True} | `
    Select Name, LitigationHoldOwner, LitigationHoldDate 

To determine which users are currently on in-place hold, use the Get-Mailbox cmdlet and retrieve the mailboxes that have a value configured in the InPlaceHolds field using the following cmdlet:

    Get-Mailbox -ResultSize Unlimited | Where {$_.InPlaceHolds} | `
    Select Name, InPlaceHolds  

When a mailbox has been placed on in-place hold, you can view the date that was placed on hold and which user enabled the setting by viewing the properties of the Get-MailboxSearch cmdlet:

    Get-MailboxSearch | Select ...