XenServer 6.5 Service Pack 1 support for:
- Microsoft Windows 10
- Microsoft Windows Server 2012
- Ubuntu 14.14
- SUSE Linux Enterprise Server 11 SP3, SLED 11SP3, SLES 12
- Scientific Linux 5.11, 6.6, 7.0, 7.1
- Red Hat Enterprise Linux (RHEL) 5.10, 5.11, 6.5, 6.6, 7.0, 7.1
- Oracle Enterprise Linux (OEL) 5.10, 5.11, 6.5, 6.6, 7.0, 7.1
- Oracle UEK 6.5
- CentOS 5.10, 5.11, 6.5, 6.5, 7.0, 7.1
- Debian 7.2 "Jessie"
- VSS support for Windows Server 2008R2 has been improved and reintroduced

Refer to the XenServer 6.5 Service Pack 1 Virtual Machine User Guide for details: http://bit.ly/1JdLV4R