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 SIX.
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 SIX. The Matched filter will shows only Contacts that already exist in SIX, 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: