I haven't been using my office desktop Mac much because I haven't been into my office much, so it took me a while to pay attention to the fact that much of its networking had recently broken. Here's why:

It was still running OS X El Capitan (10.11.6) and a crucial top-level certificate expired. The machine is too old (late 2009) for the latest OS X but it looks like I can and should upgrade to High Sierra, 10.13. So much for getting anything else accomplished today...

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@11011110 Maybe misery loves company: I went to report (by email) that the printer in my office was not working, and discovered that email on my office computer was also broken. A mere 18months of no attention and everything is broken.

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