从 xp 升级到 vista 会使原 xp key 失效

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如果你购买 vista 时选择 从 xp 升级的话，那么你要注意到一个条款，就是升级后你原来的 xp key 就失效了，或者说它就这么变成了盗版，又名药渣。即使你舍不得，想装到另一台机子或者做成双系统来保留它，sorry，不行。

# 来自 vista 的说明条款：
13. UPGRADES. To use upgrade software, you must first be licensed for the software that is eligiblefor the upgrade. Upon upgrade, this agreement takes the place of the agreement for the software you upgraded from. After you upgrade, you may no longer use the software you upgraded from.

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