This morning, I logged into Outlook and noticed one of my most used DL's was
missing. I opened the address book and the DL was there. I sent a message,
only to find after the message was sent, the DL was gone. Nothing in my
contacts or the deleted items file. I've even restored the deleted items
thinking I may have hit it by mistake. In doing a search, the DL is not
found. Any suggestions as to what happened and how I can correct the problem?

Restore it from your most recent backup.
People inadvertently delete DL's all the time because they use delete icon
in the DL to delete a member. Only it doesn't. It deletes the entire DL.
DL's were so poorly designed and implemented by Microsoft that we think they
were not intended for real use.
--
Russ Valentine
[MVP-Outlook]
"Laura S" <Laura (E-Mail Removed)> wrote in message
news:744A4A22-BDD5-43DD-81CE-(E-Mail Removed)...
> This morning, I logged into Outlook and noticed one of my most used DL's
> was
> missing. I opened the address book and the DL was there. I sent a
> message,
> only to find after the message was sent, the DL was gone. Nothing in my
> contacts or the deleted items file. I've even restored the deleted items
> thinking I may have hit it by mistake. In doing a search, the DL is not
> found. Any suggestions as to what happened and how I can correct the
> problem?