I'm a contractor, and don't wan't old customers information residing on current customers network, in fact - that would be illegal.
By being able to include "archives" a'la outlook does it, I could access archives as needed.
While tagging may work for some, the point is missed by the Evernote team. Since an integral part and selling point of Evernote is to integrate PDF, and pictures with notes and highlights, the DATABASE IS GROWING OUT OF HAND. I would rather loose one out of 10 databases of 1 gigabyte than one database of 10 gigabytes.