> I used HTTrack 3.16-2 to download a mirror of a site 
which 
> has content spread across several domains. The local 
> mirror on my computer works great, just as advertised.
> Now I want to upload the whole thing 'as is' to my web 
> server
> I know that HTTrack is designed for offline viewing, is 
it 
> possible to use it to 'move' a website?
Absolutely. The problem you may have here can be:
- server access rights (there is some nasty .htaccess in 
the server, preventing from accessing the pages)
- remote filesstem access rights (the webserver isn't 
authorized to access pages)

but this is definitely a remote problem ; a mirrored site
(s) will always work as good as on the local filesystem.