First, Outlook doesn't really have an address book. The Outlook Address
Book is really just a view of your Contacts folder.
Second, don't export. Create a new PST (File>New>Outlook Data File) and
copy your Contacts folder to it (right-click Contacts, choose Copy and
select the new PST as the destination). Then, close the new PST
(right-click>Close) and close Outlook. Copy the PST to the other PC by
whatever means you want, making sure the file winds up on your hard drive
with no read-only attribute and not replacing any PST of the same name. In
Outlook there, open the PST with File>Open Outlook Data File. Then you can
copy the contents of the Contacts folder to your main Contacts folder on
that machine.
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