You need to have the CAS role on the DB servers for the mailbox restore API to 
function.

See this link
http://www-01.ibm.com/support/docview.wss?uid=swg21445283

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Bjoern Rackoll
Sent: Wednesday, October 27, 2010 11:56 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] TDP Exchange indiviual mailbox restore failure

Hello Gregory,

> We met the same problem.
> The only workaround we found is that both "Exchange Domain Servers" "Exchange 
> Organization Administrators" "Exchange Public Folder Administrators" and " 
> Exchange Service" have full access on the mailbox.

where exactly on the mailbox server did you set these permissions? Did I
understand you right that this works without having to install the CAS
role on the mailbox server?

Regards,

--
Bjoern Rackoll
University of Hamburg
Regionales Rechenzentrum
Zentrale Dienste
Schlueterstr. 70
D-20146 Hamburg
Tel.: +49 (0)40 42838 - 63 11
Fax: +49 (0)40 42838 - 62 70
Mobil: +49 (0)172 427 0301
E-Mail: backup AT rrz.uni-hamburg DOT de