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Certain Files on New File Server are Slow to Open

Network Environment:
(1) New file server running Server 2008 R2
(1) New domain controller also running Server 2008 R2
- XP Pro PCs
- (1) Windows 7 Pro PC (32 bit)
- Switches on network - 100MB

I have recently installed the brand new file server as mentioned above.  Since the new file server install, when users attempt to access certain files on the file server, whether they are Word, Excel or PDFs, it can take over 15 seconds till the file finally opens on their PCs.  I do notice that the unc path in Word or Excel references the name of the old file server when attempting to open the files.  Some files open fairly quickly, in a few seconds.  The users are running Office 2007 and 2010 on their computers.
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Lucian Constantin
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ASKER

Regarding Luconstra's comment:  The users access the file directories through My Network Places. We originally tried drive mappings, but got the same results. The users open the files through My Network Places connections instead of opening through the most recent file selection.  Is there a way I can go through the files on the server and clear the cache where it is referencing the old file server?

Regarding Rhinoceros comments:  We also tried drive mapping and we got the same results -  some files took much longer to open.
If by mapping the new location but files open the same or even longer you may have a network problem.

One of the problem could be the network switch that you state is 100 MB/s - this could be enough for a small network with a light network traffic. You could eliminate this problem if the only change in your network was the server (meaning that the same number of clients with same "network habits" were accessing the old server without any problems).

In this case you should check if there were any shares for that "offline files" option was enabled.

Another thing that might be one of the problem - the way that you add that new domain controller and what is the status of your old DC for example did you move ALL of the roles to the new controller id you decommission the old one?
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ASKER

It turned out that this happened to certain Word files.  These Word files were pointing to a template file that was on a decommissioned server.  When I deleted the path under templates field (under Manage) and Add-ins in the file, the Word file opened instantly.  I will split credit for helping me out with your responses.