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Recently I bought a XBOX 360 from USA to be used a Media Extender. The AC Adapter was 110V and surprisingly unlike your laptop/mobile chargers this doesn't support multiple voltages. So to connect the XBOX in India I needed a new AC Adapter that works in 220V. I checked in my other XBOX 360 that was purchased in India and that had a 220V rating and Amazon US Store carried the 110V as an item to buy from Microsoft. So I assumed I can buy the AC Adapter locally, but bad luck. No shop (brick 'n' mortar or online) carried the AC Adapter alone separately in India. They redirected me to XBOX service centres, who said only on production of the faulty one they will give me a new one. I wrote to XBOX 360 support, surprisingly I got a reply from them the next business day. I asked for a new 220V AC Adapter, they replied that XBOX 360 bought in USA won't work in India due to voltage and DVD Region differences. I said clearly I understand that and I take the ownership, but they kept insisting that they don't support voltage convertors (which I never wanted) and they don't support using USA XBOX 360 in India.
We have received your email and as I understand, you would like to know if there is an available power converter that can be used with your Xbox 360 console bought from the United States (110V). I apologize for the inconvenience. Venkat, I regret to inform you that Microsoft and Xbox do not have a first-party power converter for the console's power supply. Although there may be third-party power converter sold that might be able to address the issue, we cannot guarantee the performance of the said items. Furthermore, use of third-party or unapproved accessories with your console may cause performance issues which would void the warranty of your Xbox 360 console. We sincerely apologize for the inconvenience this may cause you. Thank you for your time and understanding.
We have received your email and as I understand, you would like to know if there is an available power converter that can be used with your Xbox 360 console bought from the United States (110V). I apologize for the inconvenience.
Venkat, I regret to inform you that Microsoft and Xbox do not have a first-party power converter for the console's power supply. Although there may be third-party power converter sold that might be able to address the issue, we cannot guarantee the performance of the said items. Furthermore, use of third-party or unapproved accessories with your console may cause performance issues which would void the warranty of your Xbox 360 console. We sincerely apologize for the inconvenience this may cause you.
Thank you for your time and understanding.
Finally before giving up, I went to Chennai's Electronic Heaven "Ritchie Street" which is a miniature version of Delhi's Nehru Place/Lajphat Rai market or Tokyo's Akihabara. There I found a new XBOX 360 220V AC Adapter for Rs.1600. This was without any warranty, but when connected worked beautifully and my problem was solved (fingers crossed). This was much better than having a separate 220V to 110V convertor, as this was a native AC to XBOX DC Voltage conversion.
Update on 8/June/2009: Check my follow up post where I have given the address of the shop in Chennai and how you may get a free replacement from Microsoft.