My Mac is a G4 running OS 10.4.2. My Safari is 2.0.1, Netscape is 7.2, and IE is 5.2.3. The IE seems to run okay in Tiger for the most part, though as you say it will receive no future updates. I still feel compelled to check my site work in it along with other browsers, but primarily use Safari. My host is running DNN 3.1.1 This is my first experience with DNN so I haven't been in many nooks and crannies, but my concentration on using the Text/HTML module showed it at least appears for me in all three browsers, but in Safari and IE there is no Preview mode button or rows of formatting buttons, you can only edit the text in source mode. Making text changes that way updates fine. In Netscape the Preview mode shows the formatting buttons okay and seems to have full functionality except when you try to upload an image through the "Insert Image From Gallery" button. Uploading images through the File Manager seems to work in both Safari and NS. That's the best I can relate right now, being new to DNN I haven't gotten the chance yet to put the Mac browsers through very many DNN management tasks.