Thank you! I usually keep my computer on sleep. Rebooting it didn't bring the icon back. I shut down the computer last night and restarted it this morning. the Mail Icon is back. But after reading about the problems after this update this all makes me hesitant to do the update on my other computer. That one is only the free version.
I updated yesterday and lost my desktop temporarily.It was just words instead of picture and icons. I waited and stared at it. Then it all appeared except for the Mail Icon on the bottom task bar. I rebooted and it still did not appear. I have a tiny white dot when the icon should be.