If someone with the same gamertag as me deletes their Microsoft account, will I still have...

No. The numbers would still be there unless you change the gamertag.

Once you use a gamertag, it is no longer available for use on another account no matter what you do with the other account. Even if the entire account is deleted in hopes that you can then snag the gamertag associated with it, it wouldn't be possible. Same
thing happened to me, I had an older account with a gamertag I wanted to use on this account; I deleted that account, and still couldn't use that gamertag on this account. I contaced Microsoft about it and they told me what I basically told you.

Hello.

I would like to know if deleting my Microsoft account will also delete the gamertag I use and if it will be available once the Microsoft account has been deleted.

Thanks in advance.

Yes to your first question. No to the second as far as i am aware.

Someone can correct me if im wrong about that.

You can remove your account from your console in the settings but this will not completely delete your account.

It will still remain on Microsofts servers.

If you don't sign in with that account for 5 years then the gamertag will be freed up for someone else to use

One of my friends confirmed that we are still friends on his microsoft account. Would that still be the case if my gamertag and profile were assumed by someone else? It even has the same score. If I remember correctly, I created the account on a 360