combine two calendars

[mariekevink]

I would like to combine my calendar with my wife's.
We both use Office 2007 and she syncs her mobile with her calendar and I
sync mine with my mobile. Currently, she has to send me invitations to all
her appointments which I them put in my calendar.

How can I sync with her calendar so that her appointments get added to my
phone and calendar and my appointments get added to her calendar and mobile?

It would be good enough if, when I plug my phone in to her PC, it would add
her appointments to mine and then when I return to my computer, I plug my
phone in andit syncs like normal.

We do not have a network between our computers so we do not have any shared
stuff right now.

Sorry if this is the wrong forum/place for this question.

Thanks.