Go to xbox.com.
Go to
and go to Friends, sign in to your account.
Scroll down and type the gamertag here,
If they are really offline it should look like this.
If they are appearing offline it should look something like this.
It depends on what they are doing.
Sorry if you guys already knew this.
Go to

Scroll down and type the gamertag here,

If they are really offline it should look like this.

If they are appearing offline it should look something like this.

It depends on what they are doing.
Sorry if you guys already knew this.