It would be nice to be able to import from Outlook, which seems to be used by both individuals and companies, churches, alike. That may not be possible, but just a thought.
This is possible, in that you can first export from Outlook to a CSV file format, and then import from that format into ServiceBuilder.
I don't use Windows anymore, and haven't used Outlook in years, so I can't provide you better instructions, but if you're good with computers, you'll likely figure it out pretty easily. I think export was under the "File" menu.