Windows – UNC mapped drive without user sessions

There's a similar question, but it was about whether it is possible or not.
I want to put it in a different way:

How do I create a UNC mapped drive which will be mounted at startup without anybody logging in?

As an aside
I need this for a sharepoint application. I cannot just use UNC access because the web site uses impersonation and I would need delegation set up to allow for UNC access. Enabling delegation is risky and needs domain-wide configuration changes. A network mapped drive helps to avoid delegation in this scenario.