if your kernel is out of date then you could be missing out on features that are available in the new kernel
You can't throw random computery-sounding words into a sentence and expect it to somehow miraculously turn into a valid question.Unix is an operating system and a collection of utility programs.Linux is a "kernel", and can broadly be viewed as a particular "flavor" of Unix if you don't mind the Free Software Foundation getting their panties in a twist and insisting that it should properly be called "GNU/Linux" because the kernel (Linux) without the utility programs (mostly but not exclusively from the GNU project) is not especially useful.Microsoft is a company.Microsoft Office is a particular suite of programs from Microsoft.Your question makes no sense whatsoever.
When there is good reason you did not do your homework you have a valid excuse.
No, you cannot trespass someone without a valid reason.
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No, a teacher cannot fail a student without providing a valid reason.
No and there is no valid reason to.
No it's not as the management need to have a valid reason and if they don't have a valid reason they can't refuse you entry.
Well, yes. Whether it's a valid one depends on what your situation is. For example, it's a valid reason not to watch TV, but not a very valid one to skip school.
No, police officers do not have the authority to exceed the speed limit without a valid reason.
If you have a valid reason, certainly.
It is valid but it is reserved as a source address only by RFC1700 standard.
Completely free. If someone sells you Linux, it is legitimate, however, it will not be for a license to use the software. The GPL is not that kind of license. However, it is still free as in freedom, not free as in beer, meaning it is entirely valid under the GPL to sell Linux.