if ( !this.currentFolder.isOpen() ) {
this.currentFolder.open( Folder.READ_WRITE );
}
IMailFolder targetFolder = getMailFolderById( targetFolderId );
if ( !targetFolder.isOpen() ) {
targetFolder.open( Folder.READ_WRITE );
}
this.currentFolder.copyMessages( messageIds, targetFolder );
targetFolder.close( false );