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Hi<br />
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You need to check if one or more users have this exchange server still listed as their Exchange home server. A step by step from MS on how to check and correct is <a href="http://support.microsoft.com/kb/924170" rel="ugc nofollow">here</a>.
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Removed Legacy EXCH server successfully. There were 2more mailboxes not moved, Deleted those email accounts. <br />
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Thanks for your article and support
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We have installed EXCH2010 SP2 server. Moved all the mailboxes and services from EX2003 to EX2010 server, <br />
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Removed all the mailboxes from EX2003 and dismounted the mailboxblunttesbut unable to initiate uninstall of EXCH 2010. It prompts the below message.<br />
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&quot;The component 'MS Exchange Messaging and Collboration Services&quot; cannot be assigned the action 'Remove' because: one or more users currently use a mailbox store on this server. These users must be moved to a mailbox store on a different server or be mail disabled before uninstalling this server&quot;<br />
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Pls help me to uninstall old legacy server.
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We have installed EXCH2010 SP2 server. Moved all the mailboxes and services from EX2003 to EX2010 server, 

Removed all the mailboxes from EX2003 and dismounted the mailboxblunttesbut unable to initiate uninstall of EXCH 2010. It prompts the below message.

"The component 'MS Exchange Messaging and Collboration Services" cannot be assigned the action 'Remove' because: one or more users currently use a mailbox store on this server. These users must be moved to a mailbox store on a different server or be mail disabled before uninstalling this server"

Pls help me to uninstall old legacy server.

Removal of MS Exchange 2003 server from EX2010 infra.

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

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

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.