Where should my nav logo link back to?

Yes, In standard practice the company logo in the nav should always link back to the homepage right.

However, let's say I am in a new subsection or micro-site and the user starts down a conversion funnel, completing forms and booking appointments. Imagine the user makes an error and wants to start the process again, so they click on the logo in the navigation. Where should that logo take you?

Company global homepage or microsite homepage?

Is there any data to back up either decision?