What do you mean by that? Content is content, is it not?
Do you mean "organic search" (i.e. comes from the search engines) or "internal search" (meaning comes off your own search box)?
I'm not sure what you mean by "archiving". To me, that would mean putting it in a back room and making it inaccessible or semi-inaccessible to the masses.
What is the current architecture, and what architecture do you envision in the future? Do you mean just getting stuff out of the navigation and off the front page, but maintaining the current URLs? Or do you mean moving everything to /archive/page1.html?
Also, what is the goal of this change? In other words, why are you archiving? Is it part of a site redesign, an information architecture change, a minor cleanup, a reorientation in bussiness strategy?