Add the following to the network logon/logoff scripts. Modify "U:\profile" as appropriate for the profile storage location on the network involved:
Logon:
copy "U:\profile\OfficeCustomToolbar\*.qat" "%USERPROFILE%\Local Settings\Application Data\Microsoft\Office\" /Y
Logoff:
copy "%USERPROFILE%\Local Settings\Application Data\Microsoft\Office\*.qat" "U:\profile\OfficeCustomToolbar\" /Y