[threeseed]

> Sidenote: A Windows 7 PC has 38 Certificate Authority certificates installed. My Mac OS X Yosemite has 217 Certificate Authority certificates installed.

Windows 7 was released 5 years ago. Might be more relevant to compare to Windows 10 given that Yosemite is updated quite regularly.

[hsivonen]

Doesn't Windows 7 download root certs from Microsoft's repo on demand? I.e. 38 isn't the total number but the total actually seen by that PC.

[TazeTSchnitzel]

That makes a lot of sense, and would explain why the OP couldn't see the American, Japanese or Chinese CAs.