El Capitan Preferences Software Update panel missing
My friend has an iMac (9,1 24-inch, early 2009) running 10.11.6. In the Preferences pane, there is no icon for "Software Update", but his App Store "Updates" tab says "No updates available."
Problems:
1) His "Mail.app" loads, shows a window, begins to populate a window, then Quits unexpectedly. A short while later, a crash report window appears. This scenario is repeatable.
2) Using Safari to access his Earthlink account, the WebMail webpage says that his browser is obsolete. Earthlink says that they need Safari 11 or later. His Safari is Version 11.1.2. His WebMail works fine on my machine running Safari 14.0.1.
I'm kinda stumped and looking for ideas. What would you suggest I try next?
--Gil
iMac Line (2012 and Later)