Re: Official announcement of HP about stop producing HP Workstation Z820 & Z620

the HP z620/z820 systems are no longer under HP warranty, and have not been for quite a few years however some systems may have a extended warranty agreement still in place, although you can no longer buy a extended warranty  for these systems

Z800

EoL: December 2012

EoS:  April 2018

Z820

EoL: May 2016

EoS: May 2021

tell your client to call hp support and ask them since he refuses to believe you

and for those who have these systems here's a link to check warranty status

https://support.hp.com/us-en/product/hp-z820-workstation/5225041

EOL disassembly/disposal of 620/820 systems

http://h22235.www2.hp.com/hpinfo/globalcitizenship/environment/productdata/Countries/_MultiCountry/disassembly_workst_2012413133810.pdf

reply by HP rep on EOL status

https://h30434.www3.hp.com/t5/Business-PCs-Workstations-and-Point-of-Sale-Systems/End-of-support-HP-product/td-p/6359189