Hi lobo,
Interesting questions.
Here's a couple of links for you that explain what these 3 services do:
WINDOWS FAX AND SCAN:
Windows Fax and Scan
IE11 XPS SERVICE/VIEWER:
http://answers.microsoft.com/en-us/...used-for/31523589-409a-45ae-9e35-c3c25a03610d
Now with that being said, doing some quick searching of course I didn't find an explicit answer to your question of whether they are needed or not, and your other question about whether or not they can be uninstalled
OR NOT.
I also gather this isn't a performance tweak request or even a storage space reclamation issue for you, but just a knowledge question!
I have a lot of those, and now that I'm retired for the most part I can answer more of those questions these days than I have to ask! <grin>.
My experience with IE going all the way back to IE1.0 is that in the old days prior to about IE9, you could pick and choose these options from the Windows Features pick list and remove or add them back at your whim. However, with the advent of Win7x/8x and the introduction of IE9, IE10, and now IE11 (and Edge = ersatz IE12), the OS kernel includes these newer versions of IE right in the OS, and repair or removal is generally considered to be impossible.
To my knowledge, Microsoft has continued to keep a number of applets for legacy compatibility reasons that are completely useless with the complete OS level redesign of IE!
One of those applets is the Windows Features applet. IMO this could pretty much be eliminated, and many people still use this applet to try and fine-tune their PC's to make them run
"leaner-and-cleaner" as holdum mentions. Lots of us Geeks do this sort of thing, and there's even this competitive thing going around forums these days to see who has the cleanest system (talking about you Gary!!). This is really a good thing, but as OCD as I am, I just gave up doing this due to the pareto principle of limiting returns. If I attempted to spend all my free time nailing down the 20% of Windows services or background processes running on my computer to completely eliminate them to 0%, I'd never have time to repair customer computers. Or go the bank, or grocery shopping, take a walk or a drive, or anything. My opinion on these particular services is that if you were running IE8 or older, you could still play with the features applet and tune your startup profile, and if you were on Vista or XP that would be fine. But if you're running on the new Kernel of W10 which is as you know basically the W8.1 kernel, I think it's a waste of time. You might be able to stop or even remove some of these individual services, but the cost to system stability will be tremendous in my experience. You can certainly try it, though I wouldn't suggest trying it on your "daily-driver" machine, but rather on a test machine (I have a dedicated W10 machine with multiple hard drives that I use for this sort of thing). Mike H. and I did this 2 years ago when we signed up to be W10 Insider Testers; and it's been great since if I uncheck a box in some deeply hidden W10 option somewhere and the thing BSODs, I still have use of my main computer to facebook my friends about what a stupid thing I just did! Ha!
So, my advice here my friend is that if you're going to mess with that Features applet on W10, do it on a Test Machine!
Hopefully, the links above at least tell you about what those items are; my opinion is to just leave them there.
Best,
<<<BIGBEARJEDI>>>