To use all the advanced features of Inbox.com, a modern, fully capable web browser is required. It has to support frames and Javascript/DOM. If your browser doesn't support these, or if you disable those features in your browser, you won't be able to use Inbox.com webmail application.
Browsers that are fully supported:
MS Internet Explorer for Windows, version 6 and higher
Firefox (any OS), version 1.0 and higher
Netscape, Mozilla, AOL, Camino, and other Gecko-based browsers (any OS) 1)
Opera, version 8 and higher (any OS)
Chrome, version 13 and higher (any OS)
Browsers that are partially supported2):
MS Internet Explorer for Windows, version 5.x
Safari (Mac OS X), version 1.3 and higher
Opera 7.x (any OS)
1) Note #1: Gecko (Mozilla) kernel 1.3+ is required. Prior versions, pre-release, alpha and beta versions are not supported. The Inbox.com applications could work here, though.
2) Note #2: These browsers fit the requirements, but there may be bugs that can cause the application not function properly.
Browsers that are NOT supported:
MS Internet Explorer for Windows, version 4 and older
MS Internet Explorer for Mac
Opera 6 and older
Safari for Mac OS X, prior to version 1.3
Netscape Navigator 4.x and older
Any browser before the year 1998
Several rare and minor browsers
Special non-PC browsers (gaming consoles, WebTV etc.)