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Because of ergonomics.
Most Yamaha keyboards have jacks for MIDI and USB cables. Recently, Yamaha keyboards have built-in MIDI and USB cables to give the keyboard a compact look.
Windows XP, Windows Vista, and Windows 7 will support Microsoft 2010.
Windows xp can support a number of different versions, Office 2003, 2007 and the latest being 2010
Windows 98, Windows 2000, and Windows XP all support USB
Windows 95 OSR 2.1 was the first Microsoft OS to support USB, although Windows 98 offers much improved USB support. Besides Windows 95 with the USB update and Windows 98, Windows 2000 and Windows XP support Original USB, but Windows NT does not. Windows XP, with the service packs applied support Hi-Speed USB support. Resource: CompTIA A+ Guide to Managing and Maintaining Your PC. Pg. 404
No
DishnetPC does indeed support Windows Vista. It also supports Apple's iOS, Windows 7, Windows XP and Windows 8.0 and 8.1.
Windows 95 OSR 2.1 was the first Microsoft OS to support USB, although Windows 98 offers much improved USB support. Besides Windows 95 with the USB update, and Windows 98, Windows 2000 and Windows XP support Original USB, but Windows NT does not. Windows XP with service packs applied, supports Hi-Speed USB.
Windows Support Tools was created on 2003-04-24.
Windows support can be found at the Microsoft support site. Geek Squad also provides support for various computer needs not limited to Windows. The latter option you do have to pay for.
The file systems supported by Windows XP and Windows Vista are essentially the same. However, Windows Vista does not support booting from FAT32 partitions, and Windows XP does not support Windows Vista's Shadow Copy feature (which makes automatic backups of files) and will delete the backups if it accesses an NTFS Windows Vista partition.