After a version of Windows has reached its end of mainstream support date, which was the 12th of January 2015 for Windows 7 and Windows 2008 R2, Microsoft offers Extended Support in which they will continue to provide critical security updates and paid support.
|Security Updates||Non-Security Updates||Support||Paid Support|
|Extended Support||Available||Not Available||Not Available||Available|
After the Extended Support deadline has been reached security updates and paid support are no longer available for these versions.
UK Government 2018 National Cyber Security Survey
UK National Audit Office