How important are grounded 3-prong outlets?

[steve...]

Everything I have connected to the adapters is plastic so it looks like I'm OK there. It is my residence where I have a home office. The house is about 50 years old and from what I understand, the outlets are not grounded with conduit or armored cable. I wondered if my Mac stuff was more susceptible to damage, but it sounds like it is a safety issue with people, not Macintoshes. It seems like the best solution is with the GFCI outlets.


Thanks everyone for all the information.