How do I create Microsoft Office Outlook Task in Excel 2007?

[PamSue]

In Excel 2007, I am trying to use the button Create Microsoft Office Outlook
Task to use Outlook to remind me when a date approaches. I have the button on
my Excel 2007 ribbon, but it's grayed-out and I cannot use it to create tasks
in Outlook.

I know how to do it in Excel 2003, but cannot figure out how to do it in
Excel 2007.

Thanks.