A change to Microsoft's tape backup feature makes file backup tapes created with Windows Server 2003 incompatible with previous versions of Windows including Windows XP and Windows 2000.

The problem is due to a change in the Windows Server 2003 version of the free ntbackup.exe utility that comes with Windows operating systems and was first disclosed in the online security news group NTBugtraq.

The change means that backup tapes formatted using Windows Server 2003 cannot be used to restore data to Windows 2000 or Windows XP machines, according to Brian Bergin, president of Terabyte Computers, a Boone, North Carolina, IT consulting company.

When contacted about the problem, a Microsoft spokeswoman confirmed that the problem affects Windows 2000 Server and Professional as well as Windows XP.

According to Bergin, a manager in Microsoft's storage services group said the problem stemmed from an 'oversight' in testing data migration scenarios from Windows 2003 to the Windows 2000 and XP platforms.

Bergin discovered the problem while working on behalf of his customers, which are mostly small businesses with between eight and 12 workstations connected to a common file server.

"Typically, if I have a customer with a server that goes down, I pull the tape drive and the controller out of the server and put it in a workstation and restore the files they need. When the server comes back up, I can copy the files back. It works like a champ. You can go from 2000 to XP and vice versa all day long, but not from Windows Server 2003," he said.

After discovering the problem in late April, Bergin reported it to Microsoft technical support, who initially seemed uninterested in it.

"Their initial response to me was to tell me to buy third party backup software," he said.

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