Somewhat similar to this question, I'm looking for an alternative to Roboto. My office is pretty locked down. I can't install any new fonts either on my machine or firmwide, but I love the look of Roboto. I'm looking for a similar font that's included in the default Windows 7 fonts (defaults here) and to the extent there's a different/better fit in default Windows 10 (defaults here). Any thoughts/suggestions would be greatly appreciated.
A great tool to use is similar fonts from identifont. They analyze several different features of the each font and deliver a quantitative, ranked list of similar fonts.
You can see the list of the 30 most similar fonts for Roboto and Roboto 2014 on the left in each of these respective lists. Cross checking these against the list of available fonts in Windows 7 and Windows 10, it looks like Arial is the closest match. You could also use the fonts by appearance tool, which will help identify fonts with similar features (of course, not limited to those available in Windows by default).