Using older versions of Outlook for Mac in business environments
You can't import it straight into Outlook, but there is a way around this:
• Export from Excel to a csv file.
• Import the csv file into the System Contact app (it should be fairly
straightforward, especially if all fields are properly labeled).
• Select all contacts there and drag them to the desktop to create a .vcf
• drag the .vcf into the address book where you want them imported in
Outlook.
That should do the trick.
Corentin