If I change my gamertag will the old one that I just switched from be unavailable for use...

There's hope for the future, though. When a Gamertag is changed, the old one doesn't immediately become available.

If I change my gamertag today from "" to "I Am " it won't let anybody else change their tag to "" for some time.

I remember a year or so ago Major Nelson announced that many of the previously unavailable Gamertags would become available again. It's possible that if the gamertag you want was previously in use, but isn't anymore, it could become available again in the
future.

Creating a new account and changing the gamertag. However, when I tried to change my original account's gamertag to the new one, it was still unavailable. It seems that even if I use the gamertag on a different account, it remains locked.

nope, i have switched tags from one profile to another many times (like an idiot), as soon as you change the tag the old one becomes available.

your old one could be on a filter list to not allow the creation of it, even if you had it before the filter could make it so it cannot be used again.

Hello, first it's a pleasure to be able to help you today.

My name is welcome to the community.

Hello TheRonDog, Microsoft has never been very clear on this issue, but when changing a Gamertag it may be suspended to be used later or if immediately released, you will not be able to get your Gamertag back if you change it for a new one.

If you were forced to change the gamertag, it would have been forced by the Product Enforcement Team. If the gamertag was reported as being offencive, and the PET decided that it was, then the gamertag is forced to change. Chances of getting the old gamertag
back is slim to none, as once a gamertag is used, it remains unavailable for something like 5 or 7 years. Plus, there is a good chance that, even if you were able to change it back, that the PET would simply force you to change it again. And beyond that, the
more you are forced to change your gamertag for ToU violations, the more chance you have of getting suspended. I would just chalk the old gamertag up as gone, and go from there.

Hope this helps!