The DelFavorites method removes one or more folders from a user's Favorites folder.
HRESULT DelFavorites(
LPENTRYLIST lpEntryList
);
See Return Values.
In addition, DelFavorites can return one of the following values:
The DelFavorites method exits without processing the rest of the list and returns SYNC_E_INVALID_PARAMETER if one of the folders in the entry list is not a folder that can be removed from the user's Favorites folder.
IExchangeFavorites, IExchangeFavorites::AddFavorites