Why does the addy not appear in the compose window when I click on an addy to send mail?

When I click from another site on an email addy, it doesn't appear in the To line in the compose window.

Why does the addy not appear in the compose window when I click on an addy to send mail?microsoft word 2003

The tool/driver that makes Yahoo! Mail your 'default mail' client is not currently supported by Yahoo! Mail. I suggest just cutting and pasting the email address until this feature is brought back and supported.