Export email addresses from Outlook-2007 calendar event

I have a calendar event with 100 participants. I want to export the email addresses (i.e. with part with @ - not just the names) into a txt file - one address per line.

If it is any help: the To-field seems to contain the same list - but with the @-addresses replaced by person names.

How do I do that without having to double click every person to find their @-address?