I haven't seen any definitive recommendation either way on this, so I'll ask. I'm planning on purchasing the NE version within the next couple of months and migrate our current inhouse email system over. I have a dual Xeon server with 3GB of ram and will be housing about 50 users from the start. All my testing has been with the 32-bit Ubuntu distro, but since the machine is 64-bit capable, is there any benefit in going with 64-bit over the increased memory capacity? I've always seen mixed issues with using 64-bit OS'es so I have typically avoided loading up a 64-bit OS.