12-14 M lifetime as the 360 installed base grows, because Halo 3 is a must have game. It is still the top Xbox live shooter despite Gears of War 2 doing very well for itself. If Halo 3 came out in late 07 and gathered nearly 10 M already, I'd say my suggestion to the sales is quite healthy.

COD: WaW beat it last week.

12 mil....(crosses fingers)

14 million, it will sell even more when it hits $19.99

12,345,678

i think around 12 million

It will have sold pretty much 2M this year.

Quarterly though:

Q1: 600K

Q2: 414K

Q3: 258K

Q4: ~ 600K

So, it is dropping off.

I'd say for next year, we can expect 600K for Q1 + Q2 + Q3, and then ~ 400K for Q4 (this is slightly optimistic)

That'll put it at slightly below 10M. From then on out, ~ 1M more seems realistic.

11M.

12,345,677 at most.

 Are you insane! It will make at least 12,345,679!

@Oyvoyvoyv

that may be, but next year ODST is being released and the increased advertisements could very well lead to an increase in halo 3 sales aswell. Not to mention that halo 3 is still expensive in many stores. It'll be interesting to see how ODST effects halo 3 (if at all).

Yeah, I figured some things should buff its sales more than I expected, so I went slightly on the optimistic side. I might not have went optimistic enough though (considering the facts you just presented).