Report that lists customers who haven't ordered in a selected time period

There would be high value in being able to generate a list of customers who haven't had a *Sales Order* in the past month, 60 or 90 days (user selectable).

Our Sales Team could then focus their time on *cold* accounts to drum up additional sales.

The data is all in DEAR, there just isn't a reporting view that I've figured out that shows me the data this way.

cheers,

-Michael