I just bought an older home built in the 1940s, 1945 I believe. While I think the electrical box is fairly new, all of the outlets in the home are two pronged. I would like to have some three pronged outlets for my electronics and appliances. When I had the home inspection done, the inspector mentioned there was a way you could covert the outlets to three pronged in my state, MN, that was legal. Right now I'm using adapters where I need them, but would like to convert some of my outlets to three pronged. Are there any disadvantages to this or is there something I should know? How much would this cost me? Lastly, as long as I've got you here, how much would it cost to re-wire my house ballpark? I don't have the money right now, but some day down the road I may do it. My home is a one and half story with about 900 sq ft. Thanks for any help.