Regardless of whether you go Ultimate, or with the Home Premium family pack as others have suggested, you will need 3 licenses (the family pack is essentially 3 serials in one package). If there is a feature in Ultimate that you must have, then go for it. Otherwise, save yourself some cash and get a lower SKU.
i wouldn't recommend Ultimate, i think home premium would be fine for most home users
the only reason i will be using Professional is that is what i get from my school for free (Computer Science major), normally i would have gone for home premium
Yes, you do. If you don't need a serial number to install XP, then you must have 3 computers all from the same manufacturer. To upgrade them all to Windows 7, you must purchase 3 licenses... one for each. The reason you're able to get away with one copy of XP is because each computer already has a license for it and since they're likely from the same manufacturer, the same OEM CD works for all of them without asking for a product key.
------------------------------Desktop: Windows 7 Professional 64-bit; Intel Q6600 CPU; E-VGA 780i SLI motherboard; E-VGA E-GeForce 8800GT; OCZ Vista 4GB dual-channel kit; Ultra X2 750W power supply; 2 x Seagate Barracuda 7200.11 500GB in RAID 0. Laptop: Acer Aspire 8730-6314;
Reply to Zoron
Regardless of whether you go Ultimate, or with the Home Premium family pack as others have suggested, you will need 3 licenses (the family pack is essentially 3 serials in one package). If there is a feature in Ultimate that you must have, then go for it. Otherwise, save yourself some cash and get a lower SKU.
------------------------------If you like my solution the best, please remember to mark my post as the best answer!
Reply to The_Prophecy