I just loaded FF 4 this afternoon and have spent literally HOURS trying to open my Domino web mail. Can't open any attachments!! Can read, but can't OPEN or SEND any attachments. Also added FF 4 Mobile to my HTC Android Incredible. ...before I read the awful reviews. Now I wish I'd never loaded it. The old adage "don't be the first to try something" is always true. What a mess. Hope someone can fix it. My university uses Lotus 8.5. I know it is not compatible with Microsoft, but this is ridiculous!! I can't function without being able to go into my mail at home. At least the old version was usable. Come on folks...help us out. I'm calling OIT in the morning, but they will probably tell me to uninstall. Competition is tough, but if it ain't broke.....please leave it be!!!!