Script Download: ImportOSCEXOVCardFile.zip
http://gallery.technet.microsoft.com/scriptcenter/Import-Multiple-Contacts-4cbb4fee/

This script demonstrates how to import multiple contacts from vCard files in Office 365 Exchange Online. You can choose to import a single vCard file or multiple vCard files with this script.

Currently Outlook Web App supports to import a .CSV file only. You need to find a solution to convert vCard files to a csv file when migrating from another email service providers or solutions. So you want to use a script to mitigate this problem.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery