Please Note: This offer is valid from 1st May 2010 until 30th June 2010. The five year de-install / re-install warranty is available on the following models: NP305, NP310, NP405, NP410, NP410W, NP510, NP510W, NP510WS, NP610, NP610S education and non-education models. Lamp warranty remains as standard (3 years on education models, 6 months on non-education models).