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and here is a link related to @sunncy7 comment<br />
<a href="http://technet.microsoft.com/en-us/library/bb232089(EXCHG.80).aspx" rel="ugc">http://technet.microsoft.com/en-us/library/bb232089(EXCHG.80).aspx</a>
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Is it possible to customize the message that Exchange sends users when their mailbox is close to the size limit?<br />

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Is it possible to customize the message that Exchange sends users when their mailbox is close to the size limit?


Customize Exchange Mailbox Size Warning Message

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.