Microsoft Corp. today released Windows Home Server (WHS) to manufacturing, the final milestone for software that will power several turnkey home servers that OEMs will put on the market in late September and early October.

The move to release to manufacturing (RTM) means that Microsoft has wrapped up WHS and handed it off to its internal distribution teams and hardware partners, said senior product manager Joel Sider. Those OEM partners grew by two today, as Iomega Corp. and Fujitsu-Siemens Computers were added to a list that already included Hewlett-Packard Co., Gateway Inc., LaCie and Medion AG. Details on the Fujitsu-Siemens and Iomega systems were scanty today, but the former will be a 500GB product with Gigabit Ethernet, while the latter will contain up to four hot-swappable drives.

“The main change from one of the reasons the team was able to shift the server software so quickly out of development and into distribution.

“The team was very focused,” said Sider, responding to a question about how WHS was able to move from public announcement to RTM in just over six months. “But simplicity was also job No. 1. We wanted to provide a really powerful but not endless feature set. We were being pretty conservative with what we were trying to achieve, something that I think helped us avoid ‘feature creep.’ ”

Sider declined to provide specific release dates for either the stand-alone software that will allow users to install WHS on older PCs — or the various hardware products. But he did confirm that an evaluation edition would be available, with the evaluation timing out after 120 days.

As for existing testers — more than 100,000 people have downloaded the beta and RC editions — Microsoft hasn’t decided whether it will offer them a discounted system builder. “We’re thinking about it,” Sider said. “That’s been done before by Microsoft.”

Citing “early fall, late September and early October” as the likely ship dates for the first wave of WHS hardware — led by HP’s MediaSmart Server — Sider said that WHS development would continue. “We’ll keep moving forward,” he said. “There will certainly be future versions of WHS.”