Microsoft has announced that it will be donating 15 percent of the revenue from every copy of Windows Vista and Office 2007 sold in December through the Microsoft Store to the NSPCC.

The proceeds will go to the NSPCC's Child's Voice Appeal, which is raising money to increase the number of calls that can be answered by ChildLine and the NSPCC Helpline.

"We want to do everything we can to help the NSPCC reach its target, so if you are already thinking of upgrading your software in the run up to Christmas then this is a great way to do it," said Matthew Bishop, business marketing officer, Microsoft UK.