Can no longer set new appointments in Outlook 2003

[Desmac]

I've been using Outlook 2003 for some years without any problems. Today, I
can no longer create new appointments, or view existing ones. I get a message
in the reading pane stating 'This message with restricted permission cannot
be viewed inthe reading pane until you verify your credentials. Open the item
to read it's contents and verify your credentials.'

 

[Brian Tillman [MVP-Outlook]]

I've been using Outlook 2003 for some years without any problems. Today, I
can no longer create new appointments, or view existing ones. I get a
message
in the reading pane stating 'This message with restricted permission cannot
be viewed inthe reading pane until you verify your credentials. Open the
item
to read it's contents and verify your credentials.'

And what happens when you open the item? What type of account?