Migrate web application from Windows server 2003 to Windows server 2008 R2

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http://serverfault.com – I have a Web Application on Windows server 2003 and need to migrate it to Windows server 2008 R2 Both have IIS 6 on them I have tried installing Web Deploy 3.0 in both servers. I get the option to Import/Export package (in IIS manager) on 2008 server But I don't get any such option in IIS manager on 2003 server. How do I migrate/port my Web application from One server to another (HowTos)