An excellent TechNet-article explained how rules are evaluated in Windows Firewall, specifically in what order and which rules take precedence over others.
Although unsupported, it is possible to install Microsoft Security Essentials on a Windows Server 2012.
To do this, set the compatibility of the downloaded file to Windows 7, then start that file with the parameter /disableoslimit.
The installation goes without a problem, and as far as I can tell, there are no compatibility issues.
You can download the latest version of iSCSI Initiator for Windows 2000, 2003 and XP. This will upgrade any previously installed version to the latest version:
Use it as follows:
psexec -i -s cmd.exe
The command above would run a command prompt as the SYSTEM account. You can replace cmd.exe with something else, although from a command prompt, you can basically run anything else, all as the SYSTEM account.
You may encounter the problem with Windows Update to take an extreme amount of time to search for updates. Additionally, the Windows Update process (part of svchost.exe) runs at 100% CPU time and uses a large amount of memory.
You can resolve this by installing the optional KB3102810.
If you are installing a fresh copy of Windows 7 / 2008R2, it is also highly recommended to install KB3112343 before searching for other updates. This considerably speeds up the search for updates.