MS BackOffice Server 4.0 Client/Server Licenses. Aaaargh!!

Please anyone help me on this.

I've been at Microsoft's trying to decipher all that Server licenses and
client licenses thing.
I just can't understand it. :(
Maybe I'm just dumb, but I think they like to complicate things.

What exactly do I have to buy?
I want to buy Microsoft BackOffice for us here at EBONet. The software will
run on one server which will serve a network of about 30 workstations
running Windows 98. How many licenses do I have to buy, if any?

I understand that the software alone will cost me around $2,500. What are
Client Licenses exactly? What benefits will I have? On what do they differ
from Server Licenses?

I'm almost ashamed of asking this, but the fact it's that I don't understand
this licenses mechanism. Things changed a lot since my last NT Server
purchase two years ago.

TIA,
Mario Figueiredo

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