If you're looking for information for home users, see Windows 7 support will end on January 14, 2020.
With end of support Microsoft is not telling you that your operating systems won't work.
What they are saying is that after a certain date they will no longer support them.
Whether they still work or not with particular programs is up to the particular program manufacturers.
Example: Google Chrome is no longer supported for security updates in XP or Vista by Google and Mozilla Firefox is following the same path.
What this basically means with Microsoft no longer supporting an operating system is that even though hackers may find "holes" and vulnerabilities to be able to access the operating systems and cause security problems, Microsoft will no longer be monitoring or rectifying those problems by way of Security Updates each month.
You are on your own in regards to maintaining the Security of your operating systems.
What does it mean if Windows isn't supported?
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This will show you when support (Mainstream and Extended Support) for the various operating systems ends.
Windows lifecycle fact sheet - Windows Help - Microsoft Support
And these FAQs show you how Microsoft arrived at the Support Lifecycle Policy:
Microsoft Lifecycle Policy FAQ
https://support.microsoft.com/en-au/help/17140/lifecycle-faq-general-policy-questions
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Home users are excluded from this offer
N.B. Volume Licensed
https://support.microsoft.com/en-au/help/4497181/lifecycle-faq-extended-security-updates
How can I purchase ESUs?
Extended Security Updates are available through specific volume licensing programs. Contact your Microsoft partner or account team to learn more. ESUs for select Embedded products are available via your embedded device manufacturer.
Coverage will be available in three consecutive 12-month increments following End of Support. Customers cannot buy partial periods (e.g., only 6 months). Extended Security Updates are transacted per year (12-month period), commencing with the End of Support date.
Eligible customers can use the Azure Hybrid Benefit (available to customers with active Software Assurance or Server Subscriptions) to obtain discounts on the license of Azure Virtual Machines (IaaS) or Azure SQL Database Managed Instance (PaaS).
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FAQ about Extended Security Updates for Windows 7: Last Updated: Last Updated: 19 Jan 2020
https://support.microsoft.com/en-gb/help/4527878/faq-about-extended-security-updates-for-windows-7
This article is intended for use by IT professionals. If you're looking for information for home users, see Windows 7 support will end on January 14, 2020.
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Now we also have this at October 9, 2019, 6:40am EDT :
https://www.howtogeek.com/443573/how-windows-7s-extended-security-updates-will-work/
The average Windows 7 user can’t buy these updates, however. They’re only available to businesses and other organizations.
Some good news: Instead of just being available to large companies with volume licensing agreements, Windows 7 Extended Security Updates (ESUs) will be available to businesses of any size—even small or mid-size companies.
Microsoft won’t sell you these updates directly, and they’re not available through normal retail channels. According to Mary Jo Foley, Microsoft officials said these ESUs must be purchased “from qualified Cloud Solution Provider partners.” A Microsoft blog post about Windows 7 support invites interested parties to “Please reach out to your partner or Microsoft account team for further details.”
Cheers.