public static Outlook.MAPIFolder GetOrCreateFolder(this Outlook.Folders folders, string path)
{
var pathSeparatorIndex = path.IndexOf("\\", StringComparison.Ordinal);
var currentFolderName = pathSeparatorIndex < 0 ? path : path.Substring(0, pathSeparatorIndex);
var matchingFolder =
folders.OfType <Outlook.MAPIFolder>()
.FirstOrDefault(f => f.Name == currentFolderName) ??
folders.Add(currentFolderName);
return(pathSeparatorIndex < 0
? matchingFolder
: GetOrCreateFolder(matchingFolder.Folders, path.Substring(pathSeparatorIndex + 1)));
}
