If you migrate your file server to a new server and your Windows 7 offline files are pointing to your old server.
You can fix this by deleting the content of
Client Side Caching or the CSC folder in the Windows folder.
The
CSC is protected Windows file so you better leave it alone.
There is way to remove
Offline Files Cache by entering a registry key and rebooting your computer.
To do this;
1. Open the registry editor by going
Start, type
regedit in the windows search box and hit enter.
2. Navigate to this location
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesCscParamers
3. Right click and create new
DWORD and rename to
FormatDatabase
4. Double click the new key and change the
Value Data to
1.

5. Reboot the computer
Remove Offline Files Cache in the Windows Command Prompt
The process above can be done by simply running this command in the your commandline prompt (cmd) as administrator.
1. Run the
cmd program by going to
Start> type
cmd in the command prompt.
2. Right click
CMD and click
Run as Administrator
3. Type the command bellow in the command promtp;
reg add HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesCscParameters /v FormatDatabase /t REG_DWORD /d 1 /f

4. Reboot the computer