distribution list not appearing

[Youssef]

Hello,

I have creasted a distribution list that shows if I click
on the contacts folder.
However when I open a new message and then click on "To"
I am not able to select the distribution list as it does
not appear whatever I select from the "Select names from
the".

Even when I choose contacts in the "Select names fom the"
it does not appear whereas some contacts appear twice,
which I also don't understand why.

Thanks in advance for your help.

Youssef