Microsoft Points were discontinued in 2013 in favour of local currencies. Therefore you can only purchase digital content using your own currency on the Xbox One.
If you still have remaining Microsoft Points, yes, however Microsoft has transferred from Points to actual Dollar value."As part of the next Xbox 360 system update, Microsoft Points will be retired, and transactions on Xbox will take place using your local currency instead of Microsoft Points. Microsoft Points Cards you purchase from retailers will continue to be redeemable on your console and Xbox.com until further notice. Microsoft has no plans to discontinue acceptance of previously purchased Points cards and codes. For more information, see Microsoft transition to local currency." - Microsoft Xbox
Nope
Microsoft points are the virtual currency of the Xbox Live marketplace. Games can be purchased from the currency and used as "real" money. Microsoft points can be acquired from stores such as Wal-Mart of Gamestop.
You can purchase Xbox games online from the Xbox Arcade Marketplace. You can do this using digital currency known as Microsoft points which can be purchased for money.
Personaly I think that the Microsoft Xbox and the regular one is that the Microsoft Xbox is smarter.
£35.99 recurring or one-off 4200 microsoft points (xbox)
Xbox is always having promotions check on Xbox.com for any upcoming promotions. There was one that if you reffered a friend you got something, but it has ended. Microsoft's Xbox has a rewards program here http://rewards.xbox.com/ They are however temporary points and will expire if not used.
yes, the webcam specifically designed for the 360 will work, I have one myself
Xbox Xbox 360 Xbox One
Microsoft developed the Xbox series of consoles, comprising of the original Xbox, Xbox 360 and Xbox One.
You can't repeat using the same Microsoft Points thing on different 360 systems
You can either inform Microsoft or call the people you bought from and explain your problem and you should receive another one.