We really didn't need postings on Microsoft's Careers page to tell us that a successor to Windows 7 is in the works. The only information in those job ads is that there could be some focus on Internet Information Services (IIS) and Windows Live Mail integration. Other than that Microsoft just plain appears to be setting everything up for testing future development builds. Please page me when there's a leaked version of the builds, until then these are just job postings. [Ars Technica]