Performing the Upgrade to IIS 7
Applies To: Windows 7, Windows Server 2008, Windows Server 2008 R2, Windows Vista
The upgrade to IIS 7 is part of the upgrade to Windows Server® 2008 or Windows Server® 2008 R2. You can find general information about upgrading to Windows Server 2008 at Guide for Upgrading to Windows Server 2008.
After the Windows server has been, you will use the Server Manager tool to add the Web Server role. Steps to use Server Manager to install the Web Server role can be found at Installing IIS 7 on Windows Server 2008.
When you perform the upgrade, the operating system examines the hard disk drive for any Microsoft applications that were installed on the earlier version of Windows. When it sees the earlier version of IIS, it will back up the configuration settings and reapply them to the newer IIS 7 after the operating system is upgraded. It will also leave intact any non-Microsoft content so that your Web pages and applications are there after the upgrade.
Please note that the Windows Firewall is on by default in Windows Server 2008. If you are using any custom ports, you must ensure that they are enabled after the upgrade. For more information, see Windows Firewall.