Ever wondered when VMware stop supporting certain versions of vCenter Server / ESXi or in fact, any VMware product? Check out the VMware product lifecycle matrix here.
Also review this page or the excerpt below for terminology
General Support Phase
The General Support phase begins on the date of general availability of a Major Release (“GA”) and lasts for a fixed duration. During the General Support phase, for customers who have purchased VMware support, VMware offers maintenance updates and upgrades, bug and security fixes, and technical assistance as per the Support and Subscription Terms and Conditions.
Technical Guidance Phase
Technical Guidance, if available, is provided from the end of the General Support phase and lasts for a fixed duration. Technical Guidance is available primarily through the self-help portal and telephone support is not provided. Customers can also open a support request online to receive support and workarounds for low-severity issues on supported configurations only. During the Technical Guidance phase, VMware does not offer new hardware support, server/client/guest OS updates, new security patches or bug fixes unless otherwise noted. This phase is intended for usage by customers operating in stable environments with systems that are operating under reasonably stable loads. ( See Lifecycle Support Summary Table)
End of Support Life (EOSL)
A product has reached its end of support life when it is no longer generally supported by VMware. End of support life for a specific product is either end of General Support or end of Technical Guidance, if available for that specific product.
End of Availability (EOA) / End Of Distribution (EOD)
A product has reached its end of availability when it is no longer available for purchase from VMware. A product has reached its end of distribution when VMware can no longer make it available as a download from vmware.com or distribute the product in other ways. The end of availability and end of distribution may coincide.