I have same issue

My wife and I work out of our home. We each have a new Dell laptop running
Vista Home Premium & Outlook 2007. We have DSL thru Verizon and a Westell
ADSL+Versalink router (Model D90-327W15-06). Using the Share Calendars
Online function in Outlook, I loaded my calendar online (I’ve limited viewing
to those I invite). I then sent her an email invitation to subscribe to my
calendar. When she opened the email, she clicked on the “Subscribe to this
Calendar� button and it asked for her username and password which she entered
(yes, she had already setup a Microsoft Office Online account) but she got an
error message “Access to the resource was denied. If you have signed into
and saved your Windows Live ID with a Web site, sign out of that Web site,
and then try this operation again.� When she invited me to view her
calendar, I got the same error message.