I have a client who reads his xtra email via IE 11.0.9600.16659

When he composes an email and tries to bold, italic, underline, bullet point etc his text it doesn't work.

Oddly enough changing colours does work and the indent works but nothing else.

I've put yahoo, yahoomail, xtra etc into his trusted sites, and turned int to the lowest settings. He has no addins (other than java ones) in his IE.

The site works using mozilla firefox so it is not a setting in his mail options.

I reset his browser - no go. No viruses on the PC.

Any thoughts?