In Outlook:
Click “Option” under the “File” tab.
Click “Advanced.”
Under “Export,” click “Export to a file,” click Next.
Under “Create a file type,” click CSV file, click Next.
Under “Select folder to export from,” select the contact folder that you want to export, and then click Next.
In the “Export to a File” dialog box, click Next.
Click Finish.
You can click here for importing instructions.

See also:
Tips for preparing your data before importing into Wealthbox