Can I install Exchange 2000 to another server and replicate to give high av

OK. I can just about limp by on my very meagre knowledge of Exchange so hoping that someone out there may be able to help me out with this one…

Small company, <50 users with three W2k servers. On one is installed Exchange 2000. Is it possible to install Exchange on a second server, replicate the .edb stuff (through Exchange) and have it take over if the first server goes pop? Or do we need to buy 3rd party tools? To put you in the picture, there is no cash to do this so clustering is out. Happy for a little manual intervention if required, but would prefer something that'll take over when I'm not there. I'm expecting it not to be possible, but you never know! 🙁 Many thanks, John