Do you want to send him all of your contacts, or only a selected few?
If all the contacts, the best suggestion would probably be to export your
contacts to a file, then send him the file. How to do this? File | Import
and Export. . . | select "Export to a file" | Click Next | Select "Personal
Folder File (.pst)" (if your boss wants to import into his copy of Outlook)
| Select your Contacts folder (any subfolders? There's a checkbox, if you
want to export them) | Give it a file name and finish it up.
If you want to send him only a selected few, why not just open an email
message to him, then drag and drop the "contact cards" in to the email
message and send it off (assuming he's using Outlook, of course).