How to import a pst-file to all mailboxes in a store

Is there anyone who can help me with a powershell script which import one specific pst file to all mailboxes in a store?
I have made an pst file which contains all holidays from 2013 - 2020, a want to import the file to all our users.
GKTeknikAsked:
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Kamalasekar ParthasarathyMessaging SupportCommented:
Please find the below command

Get-Mailbox -Database “Mailbox Database Name”| Import-Mailbox -PSTFolderPath “Path import pst file location”
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Kamalasekar ParthasarathyMessaging SupportCommented:
In some cases import-Mailbox cmd wil not work, then you can run the below cmd first and perform the above one

New-ManagementRoleAssignment -Role "Mailbox Import Export" -User Administrator

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