After a very slow start, Microsoft's Surface finally seems to be hitting its stride. The company made $713 million from Surface sales last quarter, a 44 percent jump over last year, according to its latest earnings report. And yes, it's attributing much of that to the Surface Pro 3, which also saw strong sales during the previous quarter. While any bump is good, it's easy for Microsoft to report revenue growth when it's starting from a low point. Apple sold around $9 billion worth of iPads during the last quarter, for comparison. It's also worth noting that the company's third quarter doesn't include sales of the new Surface 3, which doesn't ship until next month. It'll be interesting to see if that model ends up helping its Pro sibling come next quarter. Before the Surface Pro 3, Microsoft's Surface sales weren't exactly pretty -- at one point it had to write off nearly $900 million in unsold units.