Okay, I have no problem identifying the .PST file using the Outlook Interop assemblies in a C# app. But as soon as I hit a password protected file, I am prompted for a password. We are in the process of disabling the use of PSTs in our organization and one of the steps is to unload the PST files from the users' Outlook profile. I need to have this app run silently and not prompt the user. Any ideas? Is there a way to create the Outlook.Application object with no UI and then just try to catch an Exception on password protected files?

// create the app and namespace
Application olApp = new Application();                
NameSpace olMAPI = olApp.GetNamespace("MAPI");
// get the storeID of the default inbox
string rootStoreID = olMAPI.GetDefaultFolder(OlDefaultFolders.olFolderInbox).StoreID;
// loop thru each of the folders
foreach (MAPIFolder fo in olMAPI.Folders)
{
    // compare the first 75 chars of the storeid
    // to prevent removing the Inbox folder.
    string s1 = rootStoreID.Substring(1, 75);
    string s2 = fo.StoreID.Substring(1, 75);
    if (s1 != s2)
    {           
        // unload the folder
        olMAPI.RemoveStore(fo);
    }    
}
olApp.Quit();