Both batteries in the Surface Book must be charged above 10 percent to detach the keyboard. If either of the batteries has less than a 10 percent charge, the green light on the Detach key won’t come on when you press it and you won’t be able to detach the keyboard.

有线连接：有线网络连接是连接到 Xbox 网络的最快且最可靠的方法。对于有线连接，使用网线将主机连接到路由器或调制解调器。 无线连接：通过无线网络连接，无需使用线缆即可将主机连接到 Xbox 网络。无线连接让你可以自由移动主机，使之远离网络硬件（路由器、网关或调制解调器）。

备注. Microsoft Excel 可将日期存储为可用于计算的序列号。 默认情况下，1900 年 1 月 1 日的序列号是 1，而 2008 年 1 月 1 日的序列号是 39448，这是因为它距 1900 年 1 月 1 日有 39448 天。

With Xbox Free Play Days, you can play select, fully featured, hot games for free. All points that are earned and downloadable content (DLC) that you bought carries over if you buy the game at the end of the free period.

Required data is the diagnostic data that’s needed to help keep your device up to date, safe, secure, and performing as expected. Optional data includes additional details about your device and Xbox products, their settings, health, and uses.

Learn all about games and apps for Xbox and get help with any problems you're having.