Outlook 2007 and certificate problem

[Alberto]

Hi all.
I'm coming from Thunderbird and testing Outlook 2007.
I have this problem, I'm using more than one email account, one of these has
changed a security certificate, when I use Thunderbird I have 3 chooses :

1) Use this certificate permanently
2) Use this certificate only this time
3) Do not use it

with Outlook 2007 each time I open the email I receive the question :

Do you want to use it ? Yes/No

Is it possible to say to Outlook USE IT and do not ask it again ?

Thanks