Display name shows X500 address

[Sosa]

After moving a mailbox, display name shows
o=ORGNAME/ou=GROUPNAME/cn=Recipients/cn=USERNAME instead of the
"Lastname,Firstname <[email protected]>.

Any ideas?
Txs in advance

 

[Castell]

Refer to your Exchange Administrator.

 

[Sosa]

I'm in charge of the site admin, but not an expert on EX...please assist.