How do you verify username & password " forbidden access "

[DG]

A screen pop up tells me the following " Can't open this item. Access to the
account was denied. Verify that your username and password are correct. The
server responded " forbidden "

 

[Gordon]

A screen pop up tells me the following " Can't open this item. Access to
the
account was denied. Verify that your username and password are correct.
The
server responded " forbidden "

<sigh>

Hotmail?
http://www.howto-outlook.com/news/hotmailaccessforbidden.htm