How to get the Mailbox Permission of a user

List all mailboxes to which a particular user has Full Access permissions:

Get-Mailbox | Get-MailboxPermission -User xyz


List all shared/user/room/whatever mailboxes to which particular user has Full Access permissions:

Get-Mailbox -RecipientTypeDetails UserMailbox,SharedMailbox -ResultSize Unlimited | Get-MailboxPermission -User xyz

List all mailboxes to which members of a particular security group have access:

Get-Mailbox | Get-MailboxPermission -User xyz

List all mailboxes to which a user has Send As permissions:

Get-Mailbox | Get-RecipientPermission -Trustee xyz

List all user mailboxes to which members of a particular security group have Send As access:

Get-Mailbox -RecipientTypeDetails UserMailbox -ResultSize Unlimited | Get-RecipientPermission -Trustee xyz

Without creating a loop, this will cause the script to timeout with a limitations error. Please create while looping through all mailboxes first. thanks. This is for Exchange 2016 On-Prem

Thanks again!

$allmbx = Get-Mailbox -ResultSize unlimited

Foreach ($mbx in $allmbx) {
#Exchange 2016

      Get-MailboxPermission $mbx.identity -User ASmith | select identity, user, accessrights |epcsv D:\data\ASmithAccess.csv -notypeinformation
}

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but it's actually the same  as what Saif said, but implemented in your script with a for loop.

Unfortunately, this only produced one mailbox, but the user i.e. 'ASmith' has access to many mailboxes. Also the accessRights column shows "Microsoft.Exchange.Management.RecipientTasks.MailboxRights [ ]"   whereas I as expecting to see 'Full Access'.  Any thoughts?

Team,

You've all been very helpful! What a Team!!

Thanks!