Stuffit Deluxe v12 Compress files by up to 98% of their original size Compress MP3s & PDFs with no quality loss Works with your anti-virus software (like McAfee & Norton AntiVirus) The MD5 or SHA1 technologies track changes to your archives & let you know if it's been corrupted or infected The Microsoft Outlook Plugin lets you compress and email attachments on the fly and use FTP and CD/DVD Burning capabilities for Office documents directly from within Word, Excel, & PowerPoint