Earlier versions used Opera Software 's proprietary Presto layout engine .
Earlier versions had additional Internet suite features such as sending and receiving e-mail messages , managing contacts , chatting on IRC , downloading files via BitTorrent , and reading web feeds .
Earlier versions used Opera Software 's proprietary Presto layout engine and had additional Internet suite features such as sending and receiving e-mail messages , managing contacts , chatting on IRC , downloading files via BitTorrent , and reading web feeds .