Hi,
CUE does not automatically delete messages from the voicemailbox. Only the owner of a personal mailbox can delete messages
in the mailbox and members of a GDM can delete messages in the mailbox.
please see the below link for more information,
http://www.cisco.com/en/US/products/sw/voicesw/ps5520/products_tech_note09186a008036fd99.shtml
However you can configure IMAP which gives you the ability to read, mark as read or unread and delete voicemails.
The voice-mail messages are downloaded as attachments to e-mail messages. Subscribers can access the voice-mail messages
over the network or can download them selectively. If the messages are downloaded, subscribers can play them locally using standard
media players without requiring a connection to Cisco Unity Express.
So if you access your mailbox via IMAP you can delete the VMs you want to. Please refer to the following link for more information:
http://www.cisco.com/en/US/docs/voice_ip_comm/unity_exp/rel2_3/cliadmin/ch_imap.html#wp1064742
Please rate if this helps, by clicking the stars below,
Thanks