Despite initial concerns that Microsoft’s (MSFT) Windows 8 operating system wasn’t living up to expectations, a company executive on Tuesday revealed that sales have been in line with the launch of Windows 7. Tammi Reller, chief financial and chief marketing officer of Windows, announced at the Consumer Electronics Show in Las Vegas, Nevada that Microsoft has sold 60 million Windows 8 licensees to date. The figure includes sales to manufacturers for new PCs, as well as upgrades. The executive said that while “Windows 8 is a big, ambitious change,” sales are “roughly in line with where we would have been with Windows 7.” Microsoft previously revealed that it had sold 40 million licenses of Windows 8 by the end of November.