Enterprise Vault - OWA and Compability mode

I have installed OWA extensions, and this is working in IE11 against OWA/Exchange 2010. 

But as stated in the compability list, IE 10 and IE 11 must be in compability mode.

Internally this is OK, but for external (random) OWA clients, they will not use compability mode for accessing the OWA URL.

Is there a good method to force IE to go into compability mode when accessing the OWA URL?

Anders