NTLM proxy without password?

Question

I work on a corporate windows network (which I log in to) with a HTTP proxy. When I use Internet Explorer it magically uses the proxy without me needing to type in my passwo

Answer 1

Please note my edit contains an inaccurate assumption about -U and -u. I have submitted a correction, but in the interim note:

curl -U = Authentication to a proxy
curl -u = Authentication to a server

Therefore, the first command should be:

curl.exe -U : --proxy-ntlm --proxy myproxy.com:8080 http://www.google.com

and the second one, in the example for transparent NTLM:

curl -v -u : --ntlm [the redirection URL from Location: header]  

Sorry about that!