Last year I was working on a Gentoo Linux based VMWare server install where I had two VMWare images running. One image was a hardened Gentoo web server and the other was a Windows 2003 server for running ASP/ASP.NET applications for development testing. One of the requirements was to install a FTP server where multiple developers could have access to the box to test code for pre-production.
As most of you know, I'm mainly a Linux guy. I do "some" work with Windows servers, but mostly stay with Gentoo linux servers. Installing a FTP server, in my initial thinking, was "no problem". I always forget you have to pay for EVERYTHING, when it comes to Windows. You can get trials or limited use services, but there is always a catch. At the end of the day, I ended up using Serv-U's personal use FTP Server, but started running into issues since there were multiple users required to log in and manage files. In the end, we ended up purchasing a license to get over this ($$$$$).