castrox writes "Microsoft has noted that many corporate users want to run XP instead of Vista. They are now simplifying the downgrade process for top OEMs. Currently, all OEMs must call Microsoft whenever a downgrade is done. After the new procedure is put into place, OEMs may submit batches of keys to Microsoft online. According to the Microsoft blog on ZDNet, the 'downgrade software' will still need to be supplied by the end user. The deal is rather perplexing — it does not seem like you can convert the license since the only eligible versions for downgrading is Ultimate and Business. The company has more details available in a pdf document online."