Microsoft's Windows Vista operating system is quickly approaching it's end of extended support date. This means it will no longer be supported by Microsoft, just like has happened to Windows XP and older operating systems.
Similarly to what we posted about Windows Live Mail's end of support last week, there is an increased security risk associated with using unsupported products past their end of life. If new security flaws are found, Microsoft will no longer be patching them, so they'll be open for malicious users to exploit. This is even more important when it applies to a full operating system like Windows Vista.
If you are still using a computer running Windows Vista (or an even older version like XP) it is strongly recommended to upgrade to a newer version of Windows as soon as possible to keep everything secure and updated. We recommend upgrading to Windows 10 as that is currently the newest version of Windows.
For more information, check out Microsoft's Windows lifecycle fact sheet.