I recently impleneted a SBS2003 new server, replacing an old Dell WIN2000 server. Mysteriously users are complaining that QBooks and Excel spreadsheets are taking forever to open. Workstations are freezing waiting, etc. Old server was ABC.com as the domain, and I changed it to ABC.local and had all the workstations properly transitioned over. Seems to happen between 8:50 and 9:30AM then it gets "better" for the rest of the day. There are NO scheduled tasks happening in that window. Basically nothing has changed except the new much more powerful server.
The only thing I can admit to that I've read here is that I have the IP's hardcoded. Including the workstation level DNS with the server first, and a public DNS second.
They are complaining that the old server allowed them to do everything fine, and the problems started after the new much faster server.
Where to start looking? MANY thanks in advance.