I'm not aware of any functinality issues. Why?:)

I can't use sysprep. I've tried sysprep of Windows8 and windows 2012R2, none of them worked.

# ls /usr/share/ovirt-engine/conf/sysprep/
sysprep.2k12x64  sysprep.2k3  sysprep.2k8  sysprep.2k8x64  sysprep.w10  sysprep.w10x64  sysprep.w7  sysprep.w7x64  sysprep.w8  sysprep.w8x64  sysprep.xp

(In reply to Ondra Machacek from comment #2)
> I can't use sysprep. I've tried sysprep of Windows8 and windows 2012R2, none
> of them worked.

then please report sysprep issues. Please define what was not working, etc. Assumption is to use the closes general Windows version to your specific version, in this case this means Windows 8 OS type.

Created attachment 1137697 [details]
windows8.1 error running windows8 sysprep

This screenshot is running Windows8 sysprep with Windows8.1 image. There is an parsing issue of xml. Not 
sure how to fetch more details about that error, if I can help any further let me know.

(In reply to Ondra Machacek from comment #5)
> Created attachment 1137697 [details]
> windows8.1 error running windows8 sysprep
> 
> This screenshot is running Windows8 sysprep with Windows8.1 image. There is
> an parsing issue of xml. Not 
> sure how to fetch more details about that error, if I can help any further
> let me know.

which fields did you fill in, please also attach the resulting .xml file

Oh, I've found out the issue. My vm was named something like 'win8.1_64b', but computer name of windows 
can't have '.' in name. So it's actually bug in regex of vm name field of windows vms. I am closing this one.

Windows8 sysprep works fine with Windows8.1 image. (if you don't have '.' in name :))