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。

youdao

A user ID and serial number will be sent to your mailbox.

用户ID和序列号将发送到您的邮箱。

youdao

Divert incoming calls to you desired number or operator's voice mailbox.

转移来电到你所想要的号码或运营商的语音信箱。

youdao

Presumably to stem the crushing demand, Mailbox restricts the number of new accounts that can be activated at a time.

CNN: Dropbox acquires buzzy app Mailbox

The Mailbox app, which will remain a stand-alone app after the acquisition, features a number of swipe gestures that allow users to quickly plow through email messages.

FORBES: Showing Broader Ambitions, Dropbox Acquires Mailbox