In what way was it neglected by Serbia? Until the US - led coalition intervened, the territory was actually an integral part of orthodox Serbia. Now it has become a muslim enclave with a US base and very palpable tension on both sides of the border. If there is investment to be made there, I think that it would likely be of the of the "carpetbagger" variety. All Europe is well represented there and the currency is for all intents and purposes the Euro. But if ever there was a future war zone to be found in Europe, then Kosovo is it.