Hello 343.
So at work today, it suddenly hit me that I had a gamertag several years ago that I played the majority of Halo 2 and 3 on. It was obviously a very busy day for me.
I decided that I would search on the site, here, and see if my old GT stats were on here, and they are!
I want the stats from my halo 2 and 3 career to be on my current gamertag. Is this possible?
Sorry OP, it’s not possible to merge accounts. If you changed your gamertag, rather than creating a brand new account, you could load up the old Halo games and play a match or 2 to sync your stats. The only things that wouldn’t sync though are your Halo 2 stats, as the original Xbox Live multiplayer servers are no longer available 
Is this the same case for Halo 4 and Halo reach? Can you not merge accounts period? (i.e. different emails and different gamertags)
> 2535463271222962;3:
> Is this the same case for Halo 4 and Halo reach? Can you not merge accounts period? (i.e. different emails and different gamertags)
Yep it’s the same - you can’t merge gamertags together at all