I have a Dell server that is 6.5 years old and is running Windows Server 2003 for Small Business Server. This is the only server in my office so it acts as a domain controller, file server, houses the free SQL database as well as Quickbooks. It also controls DHCP and DNS. My LAN connects via a NetGear unmanaged 48 port switch. The server has worked perfect for many many years, and I have never had any issues with it. Until now…in the past few weeks we upgraded our 20 client PCs from XP to Windows 7 Pro. Now we are experiencing freeze ups of the clients when they access anything on the server, Excel, Word, Quickbooks or SQL, or the network connection just drops and a reboot is required by the client to get the server connection back. Also now when I join a new client to the domain I get a warning that Win 7 is not compatible with Windows Server 2003 for Small Business Server, but I can click a checkbox that say “do not show this again” and then I click “run anyway” and the join is made. I have attached that screen shot.
My issue is I am afraid to spend $4-5K on a new server running Windows Server 2012 Std and then find it does not remedy the problem. Any suggestions or comments to steer me in the right direction would be most appreciated. I also did a test and I cannot join the domain at all with a Windows 10 PC.