Get-Mailbox -OrganizationalUnit HomeOffice | Import-Mailbox -PSTFolderPath C:\PSTFiles\ pst files that are located at C:\PSTFiles to all the mailboxes whose user accounts are in the organizational unit named HomeOffice is: The command needed to import calendar data from. If you use Exchange 2007 or 2010 the Exchange administrator can import the calendar from a pst file directly into Exchange mailboxes the Import-Mailbox cmdlet.
(This form may not work with newer versions of Outlook.) Using the Import-Mailbox cmdlet With older versions of Outlook, you can use the Transmit Holidays Form.