functional obsolescence
Definition
Impairment of the usefulness of a device or equipment due to a design defect, or due to its inability to be upgraded or modified to serve the user's current needs. For example, a relatively new computer becomes functionally obsolete if it cannot run the latest program or peripheral the user wishes to use.
News containing the term functional obsolescence
http://www.businessdictionary.com/definition/functional-obsolescence.html

