# Possible to set all App pools/Websites on an IIS 6 and/or IIS 7 server to 4.0 instead of 3.5 at one time?

Is it possible to set all App pools/Websites on an IIS 6 and/or IIS 7 server to 4.0 instead of 3.5 in one fell swoop?

Basically we have many servers, and will be upgrading all them 4.0 from 3.5. Right clicking and changing each site would be rather cumbersome. The servers are a mix of IIS 6 and IIS 7

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You could use appcmd.exe coupled with PSEXEC.exe.
psexec.exe @file="c:\path\to\file\with\allserverx.txt" %systemroot%\system32\inetsrv\APPCMD.exe set apppool /apppool.name:www.mysite.com /managedRuntimeVersion:4.0