Sorry for the confusion. I understand that there are 2 different products, Zimbra desktop (installed software) and Zimbra collaboration suite (web based product).
I am successfully using Zimbra desktop, which is working great for me when I am at my computer. What I am trying to do is set up a web based version that will be available to me no matter where I am. If this requires both a web server install and a web client, that would be great, so long as I can "fetch" mail from my various email accounts. As far as "ZCS open source", I really don't need the extra features in the full ZCS application, so I'm hoping I can get this done with the free "ZCS open source" version.
Back to the windows question. Among other posts, I found this one on a Zimbra blog stating that ZCS can be installed on a windows server:
Introducing ZCS for Windows Server » Zimbra :: Blog
However, there do not appear to be any windows install files, or instructions to be downloaded.
I may have confused you with my p.s. about the "free yahoo" account. Free yahoo accounts do not allow pop access, though Zimbra desktop can "fetch" free yahoo mail anyway. I was wondering if ZCS has the same "special" capability.
Thanks for your assistance,
Sup