Outlook should be open prior to importing Clients. This is not required but speed will be improved.
You can click the check box next to multiple Clients to import them into SI.
There are column filters:
There are filters in the ribbon for showing All, New, or Matched Clients. The New filter shows only Clients who don't already exist in SI. The Matched filter will shows only Clients that already exist in SI, use this for updating information for existing Clients. You can also choose a specific Contact Folder from Outlook.
There's a search field:
Select an available Address Type from Outlook to import, and also choose if you want to "Import Company Name as Client Name":