There can be up to five stores per storage group, and any number of the five stores may be mailbox stores.
每个存储组最多可以有五个存储，这五个存储都可以用作邮箱存储。
No matter which machine a user happens to be using, she can read mail from her mailbox and send mail to users in the group and elsewhere.
无论用户用的是哪一台机器，均可以从自己的邮箱中读取邮件并发送邮件给其他地方的用户。
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