Microsoft has a second shot at Vista SP1

The company's second spin at a Service Pack for Vista should be last before an official launch next month, but no final date has been confirmed

Microsoft said on Thursday that it has released another updated test version of Windows Vista Service Pack 1.

The company said that the new version, dubbed "Windows Vista SP1 RC Refresh 2", has been released to about 15,000 beta testers. The code is not being made available publicly, Microsoft said.

The product is still on track to be finalised this quarter, Microsoft said, while offering its standard caveat. "The final release date is based on quality, so we will continue to track customer and partner feedback from the beta program before setting a final date," the company said.

Earlier this month, Microsoft released the first refresh to the release candidate of Vista SP1 to about 15,000 testers and later to the public.

As for XP, Microsoft said it had already released "Windows XP SP3 RC Refresh 2" to beta testers on Wednesday. Microsoft said it is aiming for a release sometime in the first half of this year, but added: "Our timing will always be based on customer feedback as a first priority".