Export All Contacts from Mailboxes with a certain Title & Office Field

Hi

I want to be able to export the contact items from all mailboxes with a particular Title and from a particular Office.

I have tried....

get-user -resultsize unlimited |where-object {($_.title -eq "Partner") -and ($_.office -eq "London")} |new-mailboxexportrequest -includefolders "#Contacts#" -filepath "\\SERVER\export\contacts.pst"

But the nothing collects into the PST and I get no error.

It would be good to split them into one PST per user, but i dont mind if they are all in the same.

Thanks