Fenrir.Mariane said:
Just pay attention to WHOSE profile you use FFXI with as obviously once you bind the POL account to the profile you're stuck with it.
I use an Japanese POL account with FFXI with a (former) USA account which I recently migrated to my real country (Brazil) which was recently added to the list of officially supported countries on XBOX Live.
Once you bind a POL account to a XBL gamer tag it can't be separated anymore and to play FFXI on a XBOX360 with your POL account you will need *THAT* gamertag/profile.
Incorrect. it can be removed by calling playonline and giving them the proper account verification to remove it from a gamertag completely. I have an EU account on NA xbox and i had to separate it from EU XBL to get onto a new gamertag. It is possible to separate barring you have the proper information SE requests.