No.
Well actually, Linus Torvalds wrote Linux some time after Microsoft halted sales of the Microsoft version of Unix, then called Microsoft Xenix. Microsoft Xenix: http://en.wikipedia.org/wiki/Xenix Yes, Microsoft used to market it's own version of Unix to the world. Microsoft did not create Unix, nor did IBM. Though IBM also has sold and continues to sell it's own version of Unix called AIX. AIX is very proprietary and there are people (actually, a LOT of people) who have difficulty characterizing AIX as Unix. In the unlikely event any purists ever read this, yes, I know Unix is actually a specification, not an operating system.
If by 'Microsoft' you mean 'Windows', then the difference is the platform.
None of the above.
A Unix shell can be obtained in Cygwin, a Unix compatibility layer used to compile Unix programs and run them on Windows. Microsoft also makes a shell known as "Windows PowerShell" which incorporates more Unix-like features than the standard command prompt.
Microsoft Windows and UNIX
Microsoft Word is a word processing program produced by Microsoft.
While Microsoft Office is not available on Unix-like systems, you can use other offices suites to open the Excel file format. Consider trying LibreOffice or OpenOffice.org; both are excellent open-source office suites that support most Microsoft Office file formats.
UNIX, Microsoft Windows, and Linux ARE network operating systems.
LPR Port Monitor feature
Yes it does. Microsoft releases version for Windows and Mac OS X operating systems. While for Unix and Linux there is open source alternative called Moonlight. It is not fully compatible with latest version of Microsoft released Silverlight.
Andrew Lowe has written: 'Porting UNIX applications to Windows NT' -- subject(s): Application software porting, Microsoft Windows NT, UNIX (Computer file)
AbiWord is an open source word processor available for Unix-like systems. It does ot have all of Microsoft features but works similarly. to MS.