Calendar is a downgrade because see less data on screen than before.Email is downgrade also for same reason. I can see 10.5 emails listed on screen with OS5 but only 8.5 with OS7.Same for Home Screen. Could have 6 icons across on OS5 but only get max of 4 on OS7. Caveat still need to look into new themes for OS7 that might allow more icons across.Some HTML emails show up as blank. Quick search shows this to be a known OS7 bug. Column view option view gone in default Browser. Good: OS7 is faster and smoother.OS7 has handy, instant mini sub menus to speed navigation or tasks.OS7 way better battery and memory management.All my OS5 apps seem to carry over and work fine.Default browser tons faster. Kind of sideways move. Some better stuff with some stuff I really miss.