I found an old 'VTech e-Mail PostBox Conpanion' box, model #80-3647, serial #020025649 0101 in a yard sale (cost "get that trash out of here"). I can remember when the units first came out. There was no manuals with it. Where can I go to print out the necessary manuals and/or paper work to try and get the unit up and running, if possible?????

I looked over and not even on the Vtech support site there isnt anything about ...But I did found an article that says something that some providers still connect them ...and so...make a phone call to your internet provider to see whats the solution ...I understood that once connected the Yahoo domain have a working service ..(at least they use to ) ..not free but still on..
if it is functional ..I guess it has a Lan card or a modem function that you have to configure ...I tried to find you some tutorials about ..but I guess it is a museum piece and no one has the will to do it ..
http://www.vtechphones.com/vtechui/support/index.cfm
Here is a link from Vtech support site..try to write them an email and see what they say about ..
http://www.smartcomputing.com/editorial/article.asp?article=articles/hardware/2000/h0312/08h12.asp