喺2004年12月31日，微軟終止了NT 4.0包括安全更新的所有技術支援。因此，微軟建議目前嘅Windows NT 4.0客戶升級為更新、更安全的作業系統，例如Windows 8或者Windows Server 2012。
On December 31, 2004, Microsoft terminated all technical support for NT 4.0, including security updates. For this reason, Microsoft recommends that current Windows NT 4.0 customers upgrade to a newer, more secure operating system, such as Windows 8 or Windows Server 2012.