I would like know if anybody can help me choosing a good VNC Software for Servers on Windows 2008 and Clients on Windows 7 (for now on Vista, but in October, all the machines will migrate to Windows 7)? Internet cannot help me finding. And it's important that it's free, or not too expensive. Thank you.
I would say try RealVNC. It's good and very compatible. I'm using it on a Windows 7 Beta Edition, and it works without problems. For Windows 2008 Server, I don't know, but the kernel is the same as Vista.
I can't find any good reason not to use built-in RDP server, as on Windows it beats VNC hands down. 3 sessions ought to be enough.
http://www.uvnc.com/ if you must.
I like UltraVNC.
Tight VNC works best with Windows Vista/XP/2K3/2K8/7, either 32bit or 64bit. We use it with our Customer sites, over 8,000 machines. Issue with RealVNC/UVNC with XP to 2008, works ok, but from 2008 to XP, Vista, 7 doesn't work too well. Disconnects out of the blue.
We find TightVNC to be a good all-rounder, remote video is a little slower compared to RealVNC Winxp - Winxp or Win2K3 but it's reliable.
I know its not specifically what you are looking for, but you might want to give LogMeIn (http://www.logmein.com) a look. They offer a free version (paid adds support for file transfer, and printer/audio redirection) that I find works much better than VNC.
It requires no firewall setup on your part (Windows or hardware), and uses a central negotiation server so it makes it dead-simple to support users that have dynamic IPs (home users, laptop usrs, other varieties of telecommuters).
I have entire offices using it, it makes remote support a snap.
I know that OnlineVNC Server has good Windows 7/Vista support. Maybe it will be usefull for you too. It works as Windows service and you can Login/LogOff/Lock current user without disconnecting.
We have hundreds of mobile computers we maintain over Ultra VNC which proved itself to be the best one out there. TightVNC was giving us issue where a windows would be maximized on the desktop but I would not see it via tightVNC. Solved that issue by checking Poll Full Screen, System HookDll and Video Hook Driver option under the property page. Hope this helps.