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check the following, not 2011 but still...<br />
<a href="http://social.technet.microsoft.com/Forums/en-ZA/exchangesvrgeneral/thread/b49f029e-ec43-424a-a096-0c1c632f96bf" rel="ugc nofollow">http://social.technet.microsoft.com/Forums/en-ZA/exchangesvrgeneral/thread/b49f029e-ec43-424a-a096-0c1c632f96bf</a>
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check the following, not 2011 but still...
http://social.technet.microsoft.com/Forums/en-ZA/exchangesvrgeneral/thread/b49f029e-ec43-424a-a096-0c1c632f96bf [http://social.technet.microsoft.com/Forums/en-ZA/exchangesvrgeneral/thread/b49f029e-ec43-424a-a096-0c1c632f96bf]

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The one response did not solve the problem, my actions solved it.
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The one response did not solve the problem, my actions solved it.

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I migrated all of our user's mailboxes last night. This morning, no one's e-mail was showing new messages and Outlook would not connect to Exchange. I picked one user and did some experimentation based on forum articles (e.g. added his user to the SBS Console was the main thing). All of a sudden after a transport restart, everyone started working except this one user. The queue shows &quot;the mailbox recipient does not have a mailbox database&quot;. I have disconnected and reconnected his mailbox to no avail.
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I migrated all of our user's mailboxes last night. This morning, no one's e-mail was showing new messages and Outlook would not connect to Exchange. I picked one user and did some experimentation based on forum articles (e.g. added his user to the SBS Console was the main thing). All of a sudden after a transport restart, everyone started working except this one user. The queue shows "the mailbox recipient does not have a mailbox database". I have disconnected and reconnected his mailbox to no avail.

One user's mailbox won't connect after SBS 2003 to 2011 Migration

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

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).