When trying to install Exchange Server 2010 SP1, the Setup would always throw out this error:
The following error was generated when "$error.Clear();
buildToBuildUpgrade-ExsetdataAtom -AtomName SystemAttendant -DomainController $RoleDomainController" was run: "An error occurred with error code ‘3221685221’ and message ‘Overlapped I/O operation is in progress.’.".
It had to do with the Windows Firewall being turned off.
On this server the Firewall wouldn’t work and also seemed to have “lost” a registry entry, this was why it would not load the Windows Firewall Snap-in.
Here is the registry fix for this problem:
After importing the registry entry from another server, and after I restarted the server, I was able to turn on the Firewall and then install Exchange SP1 without any problem!
A big special thanks to Ben from Microsoft for pointing me out on the right direction!