A recent Post in the North Carolina Estate Planning Blog provides some good tips about when it is a good idea to revise your will. I would add another suggestion that it is probably also a good idea to do this whenever you move to a new state. Although a will is "ambulatory" (the will you properly executed in Oshkosh will be just as valid in Timbuktu), different states have different rules and procedures on the qualifications of fiduciaries and the need to produce witnesses . Revising your will in a new state and using local witnesses will greatly reduce any problems which could arise if a witness is needed to give testimony to have the will admitted to probate.