Over half of their operating system is open sourced. The commerical product itself, OSX, doesn't have any kind of licencing scheme or copy protection whatsoever..
No copy protection, but there most definitely is licensing.
http://store.apple.com/Catalog/US/Images/MacOSX.htm2. Permitted License Uses and Restrictions.
A. This License allows you to install and use one copy of the Apple Software on a single Apple-labeled computer at a time. This License does not allow the Apple Software to exist on more than one computer at a time,and you may not make the Apple Software available over a network where it could be used by multiple computers at the same time. You may make one copy of the Apple Software (excluding the Boot ROM code) in machine-readable form for backup purposes only; provided that the backup copy must include all copyright or other proprietary notices contained on the original.
Sure, it's easy to install it on ten machines, doesn't mean you're allowed to though.
and...
Microsoft with os and apps,
Maybe, but not with the "cloud" model. Conflict of interests.
Look up Windows Azure, hint, it's cloud computing by Microsoft, and apparently businesses are buying it.
At least check some facts before you post, otherwise you're typing all that garbage for nothing.
As for Cloud computing, it probably makes sense in certain limited capacities at this point, but it's definitely not for everyone (or most, even.)