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<i>can I install Exchange 2013 in the same domain</i><br />
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not until the 2003 server is cleanly removed<br />
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only 12 users, export and import is the best way to go but you would need to export everything, remove 2003, install 2013 then import - which seems like that's what you're leaning towards
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can I install Exchange 2013 in the same domain

not until the 2003 server is cleanly removed

only 12 users, export and import is the best way to go but you would need to export everything, remove 2003, install 2013 then import - which seems like that's what you're leaning towards

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migrated to 2010 and then to 2013. &nbsp;A little more time than I wanted to spend on it but was the best solution
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migrated to 2010 and then to 2013.  A little more time than I wanted to spend on it but was the best solution

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I understand that you cannot co-exist or migrate to Exchange 2013 from 2003. &nbsp;My question is can I install Exchange 2013 in the same domain and just export/import PST files to 2013 as this is a small company of about 12 users with no public folders.<br />
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And when ready, change the firewall config and spam server to the new ip address of exchange 2013. &nbsp;Down time will not be an issue. &nbsp;As opposed to co-existing, this would be a server that is configured with no mailboxes until I import the PST. &nbsp;<br />
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I really do not want to upgrade to 2010 and then upgrade again to 2013.
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I understand that you cannot co-exist or migrate to Exchange 2013 from 2003.  My question is can I install Exchange 2013 in the same domain and just export/import PST files to 2013 as this is a small company of about 12 users with no public folders.

And when ready, change the firewall config and spam server to the new ip address of exchange 2013.  Down time will not be an issue.  As opposed to co-existing, this would be a server that is configured with no mailboxes until I import the PST.  

I really do not want to upgrade to 2010 and then upgrade again to 2013.

Exchange 2003 to Exchange 2013

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

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.