IIS7.5 default caches setting for HTML

Hi,

I've got over thousands PC which runs in Windows 7 with IE9.0.36. They access IIS7.5 serving static HTML pages. Some of them can load the updated-content, some of them aren't. After inspection, I discovered that it was used default "Expires Setting" as below.

I've tested those setting with two IIS7.5 server, connected by IE9 and IE11. There is no such problem.

May i know what is default HTML caches expiry setting employed? thanks