But, one of the reasons users abandon an application is that it just does not meet their needs at all. A cold assessment of the situation could reveal that the application was ill-conceived in the first place. If so, kill it. Or at least schedule it for execution. If it doesn't meet the needs of the business, you don't need it.
Mark Patterson blogs about ERP, CRM, Financials and other business software for ITworld. Follow him on twitter @dudester.