A:AnswerNo, there are absolutely no Epson printers that will use HP cartridges. HP cartridges are for HP printers only, and Epson printers take only Epson cartridges.
A:AnswerThis printer connects via WiFi, so even if your internet is not working, the wireless connection still remains. You can still connect it via USB.
A:AnswerI can't be sure how many envelopes it will print at one time, but they turn out awesome and very professional thanks to the guides in the paper drawer. They set the envelopes or photo cards up nicely and they turn out perfectly.