If you want to export a users set of contacts from Exchange directly into a PST file using Powershell, then you can run this command using Exchange Management Shell (EMS):
export-mailbox -id User1 -includefolders 'contacts' -pstfolderpath C:User1.pst
- User1 = the mailbox that you want to export from
- C:User1.pst = the PST filename where you want to export to
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