Last May, Robbins made the unusual switch from being a well-known member of the free software community to, which is . He worked under , and had an "educational" role within the company.
Robbins told ZDNet UK in an e-mail Monday that he decided to leave because he was not able to use all his technical skills in his role.
"I didn't make the decision to leave Microsoft due to concerns about the company as a whole--Microsoft has just had a string of very successful product launches and I anticipate that it will continue to enjoy great success," he said.
"The reason I decided to leave had to do with my specific experiences working in Microsoft's Linux Lab. Although I believe that the concept behind Microsoft's Linux Lab is a good one, I wasn't able to work at my full level of technical ability and I found this frustrating," he said.
His last day at Microsoft was Jan. 16.
Robbins has accepted a job as the chief technical officer of ABC Coding Solutions, a company based in Albuquerque, N.M., that provides information products and consulting services in the health industry.
Hilf, the director of technical platform strategy at Microsoft, said the company wishes Robbins well in his new role.
"Yes, Daniel Robbins has decided to leave Microsoft to pursue his passion for software development with an independent software vendor where he will be focused on building in .Net on Windows. This move also takes Daniel and his family back to their hometown community of Albuquerque?We thank Daniel for his contribution to Microsoft and wish him the best of luck on his new job," Hilf said.
Chris Gianelloni, the release engineering lead at the Gentoo project, was reluctant to comment on Robbins' latest career move, but said that it would not affect the project: "While Daniel was a strong proponent of Gentoo back in his heyday, he's been away from us long enough for his actions to not impact us in any way."
Ingrid Marson of ZDNet UK reported from London.