Windows XP single sign-on applications will fail on Windows 7, businesses were warned today.
ChangeBase, a company specialising in application compatibility testing, said a wide range of applications would not work under Windows 7.
Users attempting to migrate from Windows XP to Windows 7 will need to update their single sign-on applications, said Greg Lambert, technology director.
The problem follows a change in the Microsoft authentication component, orginally introduced in Windows Vista. Windows Vista has gained little traction in business, making the problem a non-issue for most organisations until now.
But Microsoft plans to use the technlogy to provide user authentication on future Windows operating systems, including Windows 7 and Windows 2008 Release 2.
Microsoft has confirmed the problem on its Microsoft Developer Network blog. It explains that Microsoft has replaced The Graphical Identification and Authentication (GINA) component from Windows XP with two components, LogonUI and WinLogon.
"The user will not be able to successfully install custom logon applications," Microsoft says. "The user will not be able to log on using custom logon applications using the Windows XP technology."
The popular iPass virtual network product is one of the technologies affected.
Matt Cooke, senior product marketing manager at iPass, says, "GINA is one of the configurations people can use [on iPass] for single sign-on. There are a few tweaks we have to make with Windows 7 to address incompatibility. We will have a beta release of iPass for Windows 7 from October."
But as Matt Cooke notes, some of the other changes Microsoft has made might make it easier for his company in the future. "The Windows 7 Direct Access VPN feature supports the NDIS device driver standard for network cards, which will make it easier for us to support mobile broadband."
Microsoft has made changes to its authentication component to simplify how applications run single sign-on. In the long run, applications should run better, but in the short term, businesses could face difficulties porting their existing authentication applications to Windows 7.
|Windows 7 support for Windows XP and Vista applications|
|Microsoft faced resistance from users to migrate from Windows XP, when it launched Vista two years ago.|
|"The reason why Vista did not take off was because far too many applications did not run. With Windows 7, Microsoft has listened. Applications that run on Vista should run on Windows 7. Existing Windows XP applications have not been proven to work very well on Windows 7, but users can run a virtual engine," says Clive Longbottom, service director at Quocirca.|
|This virtual engine, called XP Compatibility Mode, is Microsoft's attempt to address the incompatibility issues with Windows XP. It enables XP applications to run on Windows 7 in a virtual machine.|
|Longbottom expects that a PC running XP Compatibility Mode will take a performance hit, as it needs to run two operating systems, Windows 7 and Windows XP.|
|There is likely to be an IT management overhead maintaining and patching the two operating systems on the same PC. He urges users to try to get applications running natively on Windows 7, rather than solely relying on XP Compatibility Mode.|