Some people are still using XP whose complete support ended in April, 2014. They should look for an upgrade, not to Windows 7 but to Windows 8.1 or the soon to be released Windows 10. Microsoft Exchange Server 2010’s mainstream support has also ended. So it will also receive only security updates from now.
Similarly, Windows 8’s mainstream support is also gonna end on January 9, 2018 and will get security updates till 2023. Microsoft is going to share some interesting details on Windows 10 on January 21 at an event. Although it has already released Technical Preview and with it comes the good old Start Menu, Modern Apps In Windowed Mode, Virtual Desktops and much more.