Windows server 2019 end of life 1809 July 8, 2019 16 32 64 128 Windows server 2019 version 1809 end of life Windows server 2019 standard 1809 end of life Windows server 2019 datacenter 1809 end of life Windows server 2019 build 1809 end of life Windows server 2019 ltsc 1809 end of life