挑战在于管理用户的数据，尤其一些常规的变更像密码重置和帐号注册等。

The challenge is managing data about users, especially routine changes like password resets and account registrations.

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模式定义变更、服务器和网络故障，以及密码过期等事件随时可能发生。

Schema definitions change, servers and networks go down, passwords expire, and so on.

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一旦BIS 4.0发布后，当用户想要从他们的设备设置托管电邮地址变更时必须输入他们的BIS帐户密码。

Once BIS 4.0 is released, the user will have to enter their BIS account password when they make changes to their hosted email address from their device.

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