**PRIOR TO PURCHASING** Please check that the operating system you intend to install is supported by this server. Please feel free to reach out for any custom configurations 😊 The following Operating Systems are supported by Dell for the R420: BIOS Citrix XenServer 6.0 Citrix XenServer 6.1 Citrix XenServer 6.2 Citrix XenServer 7.0 Novell SuSE Linux ES 11 Red Hat Ent Linux 5 Red Hat Ent Virtual3 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Suse Linux ES 10 SUSE Linux ES 12 VMware ESX 4.1 VMware ESXi 4.1 VMware ESXi 5.0 VMware ESXi 5.1 VMware ESXi 5.5 VMware ESXi 6.0 VMware ESXi 6.5 Windows Server 2008 R2 Windows Server 2008 x64 Windows Server 2008 x86 Windows Server 2012 Windows Server 2012 R2 Windows Server 2016 Windows Storage Server 2012 ------- This pre owned or refurbished product has been professionally inspected and tested to work and look like new. How a product becomes part of Amazon Renewed, your destination for pre owned, refurbished products: A customer buys a new product and returns it or trades it in for a newer or different model. That product is inspected and tested to work and look like new by Amazon-qualified suppliers. Then, the product is sold as an Amazon Renewed product.