How to share calendar folders between a 'local' Exchange calendar user and a hosted Exchange calendar user

Hi there. On our intranet we can share all Outlook folders via the Exchange 2003 groupware and this works fine. But I make use of a hosted Exchange service to access and share another calendar folder with a group of people on the 'outside'.

I want to allow my wife to 'see' this calendar, but definitely not to be able to edit it.

On her machine I don't want to give her my user details and access to this calendar as she a) could edit the folder which I don't want and b) it would involve her going in and out of Outlook 2003 profiles because as you know, one outlook profile cannot log into more than one exchange server at the same time and she's already logged into ours.

Giving her an OWA access to the offsite folder would be clunky and still allow risk of her editing / delting data by accident. Of course, I can see her calendar no problem via Exchange, and she can see my 'local' or intranet calendar.

I see both of my calendar folders at the same time, and avoid the need to swtich in and out of two profiles, by running another copy of Outlook (logged into the offsite Exchange service) in a virtual machine (Paralells, fantastic!).

I don't want to pay the US$ 50 per month for her to be a user on the hosted service and thus get read rights to my calendar that way.

Does anyone know of an inbuilt solution, or a neat and low risk product, that could allow us to let her see my offsite calendar date?

Thanks