How do I Transfer all box purchases from old Hotmail email account to new Outlook email...

Hello JuanjoWP, sorry to hear you're having trouble with your account.

You can certainly change your email and the old one will be automatically deleted when you remove it. Just follow the instructions at this link https://support.xbox.com/en-US/help/account-pro....

Since outlook is already a Microsoft server email it is not possible to use the outlook email you can add another email alias that is not a Microsoft server email (@outlook.com, @live.com, @msn.com) or you can create a new outlook email in the process of
adding an alias to the account at account.live.com/addassocid and it will put that new outlook account on the hotmail account or you can use any non MS email account.

Now keep this in mind you can have multiple aliases that you use to sign into accounts with (if they are not already a Microsoft account)

If you do add a new alias to your hotmail account and decide to remove your hotmail email from the account that will render the hotmail account null and void and you will never be able to get it back.

so do not remove the hotmail email from the account if you ever think you will need it for anything in the future

Ok, so if i create an alias and i remove my hotmail email i will not be able to use the hotmail email, but will i lose all the data and achievements of the xbox account? (i hope not...)

the account connected to my old gamertag is a microsoft account, but it doesn't have @outlook or @hotmail) and the new email account that I want to be connected to my old gamertag is also a microsoft account but @gmail, not @outlook or @hotmail

Since outlook is already a Microsoft server email it is not possible to use the outlook email you can add another email alias that is not a Microsoft server email (@outlook.com, @live.com, @msn.com) or you can create a new outlook email in the process of
adding an alias to the account at account.live.com/addassocid and it will put that new outlook account on the hotmail account or you can use any non MS email account.

Now keep this in mind you can have multiple aliases that you use to sign into accounts with (if they are not already a Microsoft account)

If you do add a new alias to your hotmail account and decide to remove your hotmail email from the account that will render the hotmail account null and void and you will never be able to get it back.

so do not remove the hotmail email from the account if you ever think you will need it for anything in the future

Ok, so if i create an alias and i remove my hotmail email i will not be able to use the hotmail email, but will i lose all the data and achievements of the xbox account? (i hope not...)

You will not the only thing that you would be doing is changing the email address that you use to sign into the account with.

Since outlook is already a Microsoft server email it is not possible to use the outlook email you can add another email alias that is not a Microsoft server email (@outlook.com, @live.com, @msn.com) or you can create a new outlook email in the process of
adding an alias to the account at account.live.com/addassocid and it will put that new outlook account on the hotmail account or you can use any non MS email account.

Now keep this in mind you can have multiple aliases that you use to sign into accounts with (if they are not already a Microsoft account)

If you do add a new alias to your hotmail account and decide to remove your hotmail email from the account that will render the hotmail account null and void and you will never be able to get it back.

so do not remove the hotmail email from the account if you ever think you will need it for anything in the future