I have a few MacPro3,1's at my school I'd like to update to El Capitan 10.11.6. Currently they're running 10.5.8. I've got really slow WiFi-internet access, but the MacPro's do not have Airport. How ...
This started the second I came back up from installing El Capitan (was getting emails just fine before) and doesn't affect my iPhone and iPad (on the same router, using Charter's, my ISP's DNS server) ...
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