· The Helvetica font is not and never has been supplied with any version of Office or Windows. If you have Helvetica installed on one system, you must have gotten it from some other software package, such as the installation CD of a printer. If you feel you have a valid license for the font, you can copy it from one computer to the other. Edit: Arial has the same font metrics as Helvetica and …
Helvetica is not a base Windows font and there are no versions I know of on Typekit. You'll have to find it elsewhere. There are plenty of places to buy fonts.
· Helvetica is not a font provided by Microsoft. It is included with some HP laser printers, or if you really need this font rather than a similar non-serif font then it can be obtained from Linotype - http://www.linotype.com/526/helvetica-family.html.
· Helvetica is a trademarked typeface. It comes loaded on most Macs and in Adobe applications. The Helvetica font is sold by Monotype Imaging, which holds the license on the full Helvetica family of typefaces . Helvetica is not included as a default font on Windows computers.
· Microsoft has made arial an alias to helvetica since Windows 3.1, now the default since Vista is Calibri. This is because Helvetica is a copy-written font (designed in 1957) and is rather expensive to license.
Helvetica is a completely free font that you can use in your graphic designs. There is no need for any license, signup, or regurgitation to use this font for your personal use. However, if you would like to use it for commercial purposes then you must have to buy it or contact the author for permissions. Helvetica Font Free Download
It has been designed on a more rigid pixel grid, so it looks better on screen than your average 'real' high resolution font. That translates in a high output resolution into not-really-subtile kerning and spacing. (That's the tell-tale sign of a printed Arial; well, that, and the …
Not only is there a a free URW++ clone of Helvetica, financed by GNU as part of the GhostScript project, it is one of the nicest looking Helvetica replacemants out there: URW++ Nimbus Sans. Unfortunately, for a lot of uses, it is a PS Type 1 font. The FreeSans font (in the openfont file format), also from the GNU project, is based on Nimbus Sans.
· I just recently bought Helvetica Now (48 fonts), which is a snob version of Helvetica, as I am such a bloody font snob. It is (also) an excellent font and has some extra features that allow hiding the most (muggle) recognizable helvetica-parts But seriously, @loukash already gave the best no-snob-answer: whatever you like the best.