DLs exported to PST files are emptied.

Hello,

We have an Exchange server mailbox whose Contacts folder contains many
distribution lists. Some of the lists contain other lists, and some of
the lists have hundreds of members.

I need to copy the entire Contacts folder to another mailbox on an
isolated network. However, when I export to PST and import the PST
file in the other company, the lists are practically all empty.

Anyone know why this is happening? Is there an alternative format to
PST files?

Thanks,

- Alan.