A:AnswerI have scanned as many as 25 pages at time, single and double sided several times, I have not had any problems. I suggest fanning the sheets before loading. I would recommend this printer.
A:AnswerYes, the lower tray can handle 11x17. Paper handling in general, both printing and scanning, is where this printer really shines, in my opinion. The print quality and speed is fine for my needs. Not astounding by any stretch, but good. I bought it for its flexibility in printing and scanning, and it has not disappointed.
A:AnswerYes, the Brother MFCJ6930DW machine is able to print envelopes. You can check the list of recommended paper at:
https://help.brother-usa.com/app/answers/detail/a_id/142407
If you continue to have questions, our Brother Customer Support Team is available to assist you direct: www.brother-usa.com/brother-support
A:AnswerYes, it comes with some short-term printer cartridges. By short-term, I mean that they'll run out of ink because the cartridges are intended to help you get the printer set up and running. I had to purchase new cartridges less then two weeks after receiving the printer.