If you have a good Mac, you can have a pretty heavy user base and still get by without server software.

We have several G3 and G4 Macs here running FMP Unlimited and FMP 4.0 without any special server software (not quite an RAIC because they each work independently). Several of these systems get hit nearly 7,000 times a day, with 98% of the hits coming in between the hours of 7:30am and 5:30pm, (about 700/hour) without problems.

Thanks!

I need to host a database over the web to about 100 users. I know that I need to have FM Pro Unlimited. Do I need to use FM Server too?

NO.

Only under heavy load you can use multiple Unlimiteds fed from FM server.

If it's your money: no, you can manage without FM Server.

If it's not your money: get it. You'll also need a new, powerful box to run it on.

I like that