Can I install Exchange 2007 onto a Windows 2008 single server, which will be the only server in the LAN? I'm guessing this server will also have the AD on it, etc.
Yes you can, it is perfectly possible. Its not a great Idea to have Exchange and AD on the same machine, it makes your network a little less secure - if Exchange is compromised then its likely your AD infrastructure will be as well.
However MS do it with their SBS product and many many small business do it.
Also, if you using server 2008, you must use Exchange 2007 Sp1
For licensing purposes, I would strongly suggest looking at SBS - it's a lot cheaper and Microsoft have pre-configured the various applications to share the resources on the server properly.
The only real limitations of SBS are (a) all the FSMO roles have to be on the SBS server and (b) you can't have more than 75 users.
Yes, you can - I've done it personally, on both 2003 and 2008.
Couple things to consider:
- RAM requirements are fairly steep for a single server install. Be sure to look into this beforehand to make sure your server can handle the demand of running Exchange, AD, etc. Check out this link for more details.
- If you're using 2008, you'll need to download Exchange 2007 SP1 and install from that, as it won't install from your disc.