Script Download: ImportOSCEXOVCardFile.ziphttp://gallery.technet.microsoft.com/scriptcenter/Import-Multiple-Contacts-4cbb4fee/
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.
You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery