I just would like to share a good website with you that I have recently found. I was looking for additional information regarding PBXs. Then I found a site that deals with PBX technology in general. It provides information about PBX history, how to build a Windows PBX and other things. If anyone is interested the site is the following: http://www.windowspbxguru.com/
I hope there will be some who finds this info useful.