Oracle may be signalling its intention to strong-arm customers over to its new virtualisation platform, but Microsoft is doing just the opposite.

As part of news announced recently regarding its virtualisation-enabled Windows Server 2008 and its new standalone Hyper-V Server software, Microsoft also unveiled its Server Virtualisation Validation Program.

The programme, which will become available next June, is intended to help companies using Windows Server in conjunction with third-party server virtualisation platforms get support if technical problems arise, according to a posting late last week on Microsoft's official Windows Server division blog.

The program allows companies such as VMware, or Xen provider Citrix Systems "to self-test and validate a specific virtualisation stack (hardware + hypervisor) to provide customers out-of-the-box support for Windows guest OSes," Alessandro Perilli, an Italy-based consultant, wrote on his Virtualisation.info blog.

Previously, Microsoft would only try to support Windows Server users using non-Microsoft virtualisation if they paid for pricey Premier Support, according to Frank Artale, vice president of business development at Citrix, who confirmed the vendor's plans to join the program.

"Now, Microsoft and Citrix can work together to jointly support customers, exchange bug info and solve problems," he said.

Until now, Microsoft only had a joint support relationship for non-Microsoft hardware virtualisation software with Novell.

Virtual Iron Software also plans to join the programme, which will enable joint support for Windows Server 2000, 2003 and 2008. Other vendors expressing support are listed online.

Market leader VMware, which has been tangling with Microsoft all year on virtualisation, "intends to review and participate" in Microsoft's programme when more details emerge, wrote Dan Chu, vice president for emerging products and markets at VMware, in an email.

"VMware and Microsoft have extensively discussed joint support for our mutual customers in the last year," Chu wrote. "We're currently working to ensure that customers receive the support they need, and that VMware environments are optimised for Microsoft operating systems and applications.

"Microsoft and VMware already handle customer support issues together through TSAnet and the direct relationship between our companies," he wrote. "The development of this programme further extends Microsoft's support policies and enhances customers' ability to choose the right virtualisation platform for their environment without worrying about the artificial constraints of support policy."

The programme does not apply to Microsoft applications such as SQL Server, although the Windows Server blog hinted that could change.

Oracle executives, in contrast to Microsoft, said last week during the OpenWorld conference that customers running Oracle applications in non-Oracle virtualisation platforms break their enterprise support contract.

VMware asserted that Oracle has been supporting their joint customers since 2006. Despite Oracle's "marketing spin," VMware is confident that Oracle will continue to its support, pointing to statements by CEO Larry Ellison and language in Oracle's own support contracts.

Citrix's Artale noted that this is "an interesting case where Microsoft appears to be much more open than other vendors" such as Oracle. He said he had not yet spoken with Oracle about Oracle's support plans, though he said any pulling of support would affect Citrix less than VMware. Most of Citrix's customers for XenServer virtualise Windows Server rather than Linux, upon which Oracle applications tend to run, he said.

In any case, some Oracle users are unfazed.

This "is nothing more than a 'good cop, bad cop' ploy'" from Oracle, said Karl Ehr, IT operations manager at Golden Gate University in San Francisco. The school plans to move some of its Oracle applications to VMware within half a year. Oracle pulling support for big users such as Golden Gate, he says, "is not going to happen."