There is a simpler way to do this, assuming you each have separate usernames. Get the name of the folder from Pegasus Mail (xxxx.pmm). Open My Computer, go the folder containing that file, right-click it and set the security so that just your user account has access to it. When other people log on and use the same email account, they will not be able to access your folder. I've done this where I work and it works fine.
There is a simpler way to do this, assuming you each have separate usernames. Get the name of the folder from Pegasus Mail (xxxx.pmm). Open My Computer, go the folder containing that file, right-click it and set the security so that just your user account has access to it. When other people log on and use the same email account, they will not be able to access your folder. I've done this where I work and it works fine.