could someone please explain to me the diff builds?

[molesaied88]

hey guys, id really appreciate if someone could explain to me the diff builds that are out there and what the diffrences are. up until very recently i though 6.1 has two builds, 19199 and 19209. now ive just discovered a third, 19716. whats it all mean??? thanks in advance

[CRCinAU]

19199 was the first official WM6.1 build that was leaked. 19209 was an updated version of that. 19716 was an internal Beta that was leaked, however the build number is misleading - it's actually a fair bit older than 19199 and 19209.