Installing Windows Sharepoint Services 3.0 to an existing Windows Small Business Server 2003 server involves a few steps. After confirming you have a good, working backup of the server, you then need to ensure that .NET Framework 2.0 and 3.0 are both installed.

I ran the WSS 3.0 installer and chose to upgrade the existing sites. The existing sites aren’t modified though, not until the Sharepoint Products and Technologies Configuration Wizard is run. This will launch immediately after the WSS 3.0 installer finishes, but in my case it failed on the first step.

The Event Log showed the following error:

Event Type: Error
Event Source: SharePoint Products and Technologies Configuration Wizard
Event Category: None
Event ID: 104
Date: 27/03/2007
Time: 8:41:56 AM
User: N/A
Computer: LLSRV01
Description:
Failed to initialize SharePoint Products and Technologies upgrade.
An exception of type Microsoft.SharePoint. PostSetupConfiguration. PostSetupConfigurationTaskException was thrown. Additional exception information: The pre-upgrade scan tool has not yet been run successfully on all content databases in the server farm. The pre-upgrade scan tool must complete without errors before you can continue with the upgrade process.
Microsoft.SharePoint. PostSetupConfiguration. PostSetupConfigurationTaskException: Exception of type ‘Microsoft.SharePoint. PostSetupConfiguration.PostSetupConfigurationTaskException’ was thrown.
at Microsoft.SharePoint. PostSetupConfiguration. InitializeTask.PrepareForUpgrade()
at Microsoft.SharePoint. PostSetupConfiguration. InitializeTask.Run()
at Microsoft.SharePoint. PostSetupConfiguration. TaskThread.ExecuteTask()

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

The pre-upgrade scan tool referred to is located in C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\BIN. To run it you simply navigate to that folder in a command line window, and then run “prescan /all”.

C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\BIN>prescan /all
0%
99%
100%
Operation completed successfully.
File Name:C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\1\ PreupgradeReport_633105822209429795_Log.txt
File Name:C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\1\ PreupgradeReport_633105822209429795_Summary.xml

When this has completed successfully, you can rerun the Sharepoint Products and Technologies Configuration Wizard from the Administrative Tools folder in the Start Menu.