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XenServer is the product. Xen is the hypervisor. The confusion has lasted nineteen years: XenSource packages Cambridge, Citrix buys it for half a billion, renames it Citrix Hypervisor, private equity restores the name, and in July 2026 XenServer 9 becomes \u201cCitrix\u201d again and supports every kind of workload \u2014 not just desktops. This is the story of the appliance, not the paper.<\/p>\n
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The free hypervisor was born in Cambridge \u2014 its origins are in The history of Xen<\/a>. What was missing was a product: an ISO, a console, a host pool, users not needing The Microsoft partnership began in fall 2006 \u2014 VMware was irritating both companies. In August\/October 2007, Citrix bought XenSource for US$ 500 million. Steve Wilson (Sun\u2019s xVM) was looking at VirtualBox on the desktop; Citrix wanted servers and VDI. XenServer was born as the \u201cMicrosoft-friendly\u201d hypervisor in the Citrix portfolio, alongside XenApp and XenDesktop.<\/p>\n Type 1, bare metal: Xen starts from the bootloader, CentOS (later) becomes dom0, XAPI speaks HTTP\/XML-RPC, and XenCenter (Windows) or On June 25, 2013, Citrix announced XenServer 6.2 was entirely<\/em> open and free \u2014 features that had been Platinum no longer required a license. XCP<\/a> (Xen Cloud Platform), the \u201calmost XenServer\u201d ISO that had existed since 2011, lost its purpose. \u201cXCP is dead; long live XenServer,\u201d wrote the Xen Project. The code moved to xenserver.org. What did not open up: the license daemon, some storage drivers, the closed-source HA.<\/p>\n Citrix\u2019s Xen* line became a single brand: XenServer became Citrix Hypervisor; XenApp\/XenDesktop became Virtual Apps and Desktops. In December 2017, 7.3 removed from Free what labs had used at no cost: storage XenMotion, dynamic memory control, GPU passthrough. Security patches for older versions required a contract. It was the spark for XCP-ng.<\/p>\n On September 30, 2022, Vista Equity and Evergreen bought Citrix (US$ 16,5 billion) and merged it with TIBCO into Cloud Software Group. The hypervisor became a separate unit and regained the XenServer name. In March 2024, XenServer 8 came out \u2014 essentially Citrix Hypervisor 8.2 CU1 with patches, a three-host trial, and a VMware migration tool. Citrix\u2019s 8.2 reached EOL on June 25, 2025.<\/p>\n In July 2025, Citrix said XenServer was returning to \u201cevery kind of workload.\u201d On July 1\u00ba, 2026, it launched XenServer 9<\/strong> (preview, GA during the year): Xen 4.21 hypervisor, a new control domain OS, NUMA, Secure Boot. CSG\u2019s XenServer unit ended; the product returned \u201cunder the Citrix umbrella.\u201d Standalone Standard\/Premium had already reached end-of-sale in June 2024 \u2014 the license now comes within Citrix subscriptions (Private Cloud, Hybrid, Platform).<\/p>\n Those who want the same stack without Citrix go to XCP-ng<\/a> (a \u201cfriendly\u201d fork, XAPI intact). Those who want KVM+LXC on Debian, Proxmox<\/a>. To take an OVA from VirtualBox and land it on XAPI: ova2xva<\/a>.<\/p>\n XenServer 9, Xen 4.21, with the Citrix logo again. The appliance from 2005 still exists. The name, for the third time, does too.<\/p>","protected":false},"excerpt":{"rendered":" XenServer is the product. Xen is the hypervisor. The confusion has lasted nineteen years: XenSource packages Cambridge\u2019s work, Citrix buys it for half a billion, renames it Citrix Hypervisor, private equity restores the name, and in July 2026 XenServer 9 becomes \u201cCitrix\u201d again and supports every kind of workload \u2014 not just desktops. \u2026 Read more<\/a><\/p>","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,2,120],"tags":[214,210,138,215,137],"class_list":["post-522","post","type-post","status-publish","format-standard","hentry","category-infra","category-linux","category-servidores","tag-citrix","tag-hypervisor","tag-virtualizacao","tag-xapi","tag-xenserver"],"_links":{"self":[{"href":"https:\/\/www.linuxpro.com.br\/en\/wp-json\/wp\/v2\/posts\/522","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linuxpro.com.br\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linuxpro.com.br\/en\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linuxpro.com.br\/en\/wp-json\/wp\/v2\/comments?post=522"}],"version-history":[{"count":3,"href":"https:\/\/www.linuxpro.com.br\/en\/wp-json\/wp\/v2\/posts\/522\/revisions"}],"predecessor-version":[{"id":1187,"href":"https:\/\/www.linuxpro.com.br\/en\/wp-json\/wp\/v2\/posts\/522\/revisions\/1187"}],"wp:attachment":[{"href":"https:\/\/www.linuxpro.com.br\/en\/wp-json\/wp\/v2\/media?parent=522"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linuxpro.com.br\/en\/wp-json\/wp\/v2\/categories?post=522"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linuxpro.com.br\/en\/wp-json\/wp\/v2\/tags?post=522"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}xm<\/code>. In 2005, XenSource became a company. Anil Madhavapeddy, from the original team, was release manager for the first commercial distribution. The trick was to hide Xen behind a Linux appliance: what the customer saw was \u201cstart VM,\u201d not \u201cdom0.\u201d.<\/p>\nThe Citrix era: HA, XenCenter, a true type 1<\/h2>\n
xe<\/code> is in charge. Live migration, pools, storage repositories, HA in 5.0 (OCaml underneath). GPUs, then vTPM for Windows 10\/11. For a few years, XenServer genuinely competed with VMware and Hyper-V. By 2014, Gartner already thought Citrix had given up on general-purpose servers and tied itself to its own VDI.<\/p>\n2013: open source and the death of XCP<\/h2>\n
2018: Citrix Hypervisor and the Free cuts<\/h2>\n
2022\u20132026: the name returns, version 9, Citrix again<\/h2>\n
Timeline<\/h2>\n
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Where it fits<\/h2>\n