"Sorry, but your system does not meet the minimum system
requirements (Adobe). The all-new Yahoo! Mail has not been tested
with your operating system (Yahoo).
"What do these two messages have in common? In both cases, they
were generated by trying to access the service or software from a
Linux-based PC. I wish I could say it was because I am running
64-bit Fedora, or because I want to do something special with the
sites, but sadly, that is not the case. In the case of Yahoo, I am
just trying to access my mail box. It does work, but it "has not
been tested," which leads me to believe that if some feature fails
to work as I expect it to, I am pretty much out of luck. In the
case of Adobe, I need to download something called Adobe Digital
Editions in order to read an electronic book from Cisco Press I
guess this indicates that Cisco admins only use Windows or Apple as
their desktop systems."