Procedures:

• Open Outlook.
• From the ribbon bar, click "File" -> "Options"
• From the left panel, choose "Advanced", look for the "Export" session. Then click the "Export" button.
• Choose "Import from another program or file" then click "Next"
• Choose "Microsoft Excel" then click "Next"
• Click "Browse" to select you Excel file then click "Next"
• Select "Contacts" then click "Next"
• Click "Map Custom Fields..."
• Map your Excel field to Outlook Contacts field by drag from left panel to the right panel.

Note: You may encounter a error when importing the Excel file in which need you to "Name" the range of the Excel file.

• Open your Excel file
• Highlight the data (1)
• Input a name in the "NameBox" (2)
• Save your file