Saving an Excel file to HTML format

If you plan to import an HTML file that was created from Excel, note:

Prior to saving an Excel file to HTML format, turn off Excel’s password protect feature.
Formulas are saved as sheet references in Excel. When an Excel workbook is saved to HTML workbook, formulas linked to a cell in the HTML workbook do not operate.
Custom view and scenarios can only be used in Excel.
Add-ins and templates are only available in Excel.