An error occurred. error code was 3221684229. Access is denied..
This seems to be a very common error when trying to install Exchange 2003 on a Windows 2008 server. It has a very simple solution which requires you to run the setup file in a Vista Service Pack 2 environment. This can easy be done by adjusting the properties of the setup.exe
Below are instructions on how to run Exchange Server 2007 in Microsoft Vista Service Pack 2 compatiblity mode:
Right click on setup.exe and then left click on properties
Click on the Compatiblity tab
Click the Run this program in compatibility mode for:
Change to Windows Vista (Service Pack 2) Then click apply and ok
You can now re run setup and it will work