IE 9 won't open or save attachment in OWA webmail on SBS

That new locked down IE9 is giving me hell on the SBS servers. Latest was to stop me saving a licence file on a remote server I was logged into. No errors, just wouldn't open or save or save as.

Messed with security xones, trusted certificates, activex filtering

Found the answer on Andy Grogan's blog

Internet Explorer > Internet Options > Advanced

scroll most of the way down the list, and untick this option

Do not save encrypted pages to disk option