You can use the Setup Editor or any text editor to specify settings in the .prf file. The .prf file can be in the client installation point or the user's home directory. If Setup is used to run Newprof.exe, the file must be named Default.prf or it will be ignored. To use a different name, you can run Newprof.exe from the command line as follows:
Newprof.exe -p filepath
where filepath is the path and file name of the .prf file.
You can use the sample Template.prf file provided with Microsoft Exchange Client to create a customized .prf file.