I created a group contact list several months ago. Today I was updating
email addresses one at a time. When I went back to open the group contact
list it wasn't there.
Not sure what you mean by "group list" since Outlook uses no such term.
Assuming you meant a Distribution List that you inadvertently deleted,
retrieve it from your Deleted Items folder.

Signature
Russ Valentine
[MVP-Outlook]
>I created a group contact list several months ago. Today I was updating
> email addresses one at a time. When I went back to open the group contact
> list it wasn't there.