Can I transfer an Xbox account (connected to a Gmail alias) to an existing Hotmail account...

I use my gmail account to access all of Microsoft services - Live, Outlook, Hotmail, etc.

You have to create an account using an existing email address. Also look for something related to alias.

ok. so I've added my sons gmail account as an alias. if I make the gmail primary how does that effect the Hotmail account & how I log in to my laptops? can he log in to his xbox with the gmail (& see his gamertag & profile) & can I log in to my devices
with the Hotmail address?

You can't really merge two Microsoft Accounts.

If you haven't invested money in the Gmail-Microsoft Account, you could simply back up all your data (i.e. OneDrive, Skype contacts etc.), and delete your Gmail-Micorosoft Account.

After you have deleted that Microsoft Account, add the Gmail address as a sign in Alias to your existing Hotmail Account.

After adding the Gmail Address as a sign in alias, make this the primary sign in email, and restore your OneDrive files to that OneDrive, and add the Skype contacts to that account.

There is no way to do what you want to do and unless you want to lose EVERYTHING on your Hotmail account DO NOT delete it you will NEVER get it back.

Ciao, mi spiace che tu non possa usare gmail su xbox.
essendo un servizio con hotmail di Microsoft. Se si desidera connettere entrambe le e-mail, è necessario configurare la sicurezza ecc. Ma condividere la stessa e-mail, ecc. L'account del prodotto xbox rimane incluso nel sistema di
hotmail. Non puoi prenderlo se non ricevi l'e-mail da microsoft.