Servers and memory

Hey everyone. I have a friend that has an older server, a HP ProLiant ML330 G3. It's running Windows Small Business Server 2003 SP2 32-bit and has 3 GB of RAM. I've checked and it looks like it can only support up to 4 GB total. I know there's some sort of limit on the amount of memory a 32-bit OS can use but I'm guessing maxing out this older server to 4 GB RAM won't cause any problems. Will the OS be able to utilize all 4 GB? Just wanna check.