如果在Outlook中配置Exchange 2007/2010下的邮箱的Exchange模式，在帐户设置中的“服务器”中显示的是邮箱所在Mailbox Server的计算机名称，但是在配置Exchange 2013下的邮箱时，这个服务器名发生了变化，显示的是一串guid码@domain.com，对此，微软官方是这样说的：
Outlook clients no longer connect to a server FQDN as they have done in all previous versions of Exchange. Outlook uses Autodiscover to create a new connection point comprised of mailbox GUID, @ symbol, and the domain portion of the user’s primary SMTP address. This simple change results in a near elimination of the unwelcome message of “Your administrator has made a change to your mailbox. Please restart.” Only Outlook 2007 and higher versions are supported with Exchange 2013.
如果get-mailbox username|fl，我们可以看到这个服务器名的GUID即邮箱属性中的ExchangeGUID，我们也可以使用get-mailbox exchangeGUID来获得这个邮箱的相关系。
以下是相关图片：
