In an interview with CNBC this morning, Microsoft's co-founder Bill Gates took a stab at the Apple iPad while bragging about how great the software giant's Surface tablet is. Gates believes that iPad owners are 'frustrated.' When asked about the declining PC market during the interview with CNBC, Gates stated that tablets are growing in popularity and tablets will make it "harder and harder to distinguish products" that are PCs vs tablets. Gates touted the SUrface tablet as a device that features the "portability of the tablet but the richness of the PC." As for Apple iPad owners, Gates believes that they are frustrated. "A lot of those users are frustrated, they can't type, they can't create documents, they don't have Office there," Gates explains. Apple apparently sold 19.5 million iPads in its last quarter, that's a lot of frustrated iPad owners. According to recent data from IDC, Microsoft has sold nearly 900,000 Surface RT and Surface Pro tablets during the first quarter of 2013. Microsoft's Surface RT has been available since October of 2012 while the Surface Pro has been available since February of 2013. Head over to the source link to watch the interview.