It still isn’t known whether Microsoft’s Surface tablet is a quiet success or a miserable failure, but the fact that the company’s vendor partners are slow to get onboard with Windows RT isn’t a good sign. That apparently won’t stop Nokia (NOK), however, as the vendor seemingly dives deeper into the Microsoft (MSFT) ecosystem without pause. Citing anonymous Taiwan-based supply chain sources, Digitimes reports that Nokia is building a 10-inch Windows RT tablet that will likely be unveiled during the Mobile World Congress trade show in February 2013. No features were covered in the report, however Digitimes says Nokia had initially planned to launch the device in 2012 but the introduction of Microsoft’s Surface slate forced Nokia to delay the device’s launch.