Even a casual perusal of the posts in this group would have answered your
question.
DL's never survive export and import. They barely survive one day to the
next on their own.
The obvious question is why would you ever export or import Outlook data?
There is never any reason to do so, and you lose a lot more information than
just DL's.

Hi Russ
The export and import works perfectly but the problem is that when I double
click on the contact person in the Dist list to make a change it tells me
that it can't find the contact do you want to remove it, but the contact is
in my main contact list. The option on the exchange server I was refering to
is when you have a global address list where all the contacts are saved and
everybody in the company can use them and one administrator can change it so
that when there is a change it is also changed in the dist list. Like I said
before if I create a Dist List and make a change on one of the contacts it
also changes it in my main contact list but when you export it and import it
in another account there is an error and it is not possible, so that is what
I am trying to get a solution for.