SalesPartner contact, listings, and sales importing tools recognize spreadsheets which are saved in the Comma Separated Value (CSV) file format.
Using Microsoft Excel you can convert your XLS / XLSX workbooks into CSV format so that they can be read into SalesPartner.
Open your workbook in Excel.
Click Save As
Expand the drop-down menu and select CSV (Comma delimited) (*.csv)
If your workbook contains multiple sheets, you'll be prompted to confirm that only the active sheet will be saved when you click OK
Now when you go to import your CSV file, SalesPartner will recognize it as a compatible file format.