So in the game i am currently running i have a virtual adept character, and to be honest i have always wondered this myself, but does a virtual adept need spirit to go to the Digital Web? I am running Mage the Ascension the revised edition.
Correspondence is cool, but
I've written this mostly from memory, but I doubt revised changed this.
Of course, if your GM says you can, you can... but so can everybody else. And that makes Spirit kinda irrelevant Sphere.