I use FMP 5/6 on macs and 4-sight fax 4.01or(4.02) 50 users. I am waiting for some confirmation that the V5 works with windows clients using filemaker, apparently there is a company developing a plug-in for FMPro, millenium something, I have the address at work, email me directly at my address and I'll send you the details, I asked them about the plug-in a month or so ago, but no reply....