Outlook should be open prior to importing Contacts. This is not required but speed will be improved.
You can click the check box next to multiple Contacts to import them into SI.
There are column filters:
There are filters in the ribbon for showing All, New, or Matched Contacts. The New filter shows only Contacts who don't already exist in SI. The Matched filter will shows only Contacts that already exist in SI, use this for updating information for existing Contacts.
There's a search field:
Once finished filtering, you can use the [Select All]/[Deselect All] buttons:
Select an available Address Type from Outlook to import:
The [Import] button will import the Contacts, but the Import Contacts from Outlook screen will remain open.