The administrator account need to have send-as & received-as permissions.
for windows 2008 you need to have the MAPI and CDO installed also.

I also found out that it need to be a member of the backup operator account
also in AD.

hope that helps



On Fri, Mar 27, 2009 at 9:15 AM, shoaibm
<networker-forum AT backupcentral DOT com>wrote:

> Hi,
>
> I am having problems in taking Mailbox backups using Networker.When I run
> nsrxchmbsv command I get an error "Insufficient Permissions to access the
> mailbox".The account I use for taking backup is Administrator who is a
> member of Exchange Administrators also which means he has full access to the
> mailbox.I have tried a lot but could not find a solution.The Exchange Server
> is 2007 running on a two node Active-Passive Cluster running on Microsoft
> Windows Server 2008.The Networker Server I use is 7.3.4.The Networker Module
> for Exchange is 5.1 SP2.
>
>
> I am able to take the backup of the Information Store successfully.But not
> the Mailboxes.
>
> Can you please send me the step by step procedure for configuring Mailbox
> level backups.Also would be great if you could list out the permissions you
> had set at Exchange level and also Networker side.
>
> +----------------------------------------------------------------------
> |This was sent by shoaib.mohammed AT tatatel.co DOT in via Backup Central.
> |Forward SPAM to abuse AT backupcentral DOT com.
> +----------------------------------------------------------------------
>
> To sign off this list, send email to listserv AT listserv.temple DOT edu and 
> type
> "signoff networker" in the body of the email. Please write to
> networker-request AT listserv.temple DOT edu if you have any problems with 
> this
> list. You can access the archives at
> http://listserv.temple.edu/archives/networker.html or
> via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
>

To sign off this list, send email to listserv AT listserv.temple DOT edu and 
type "signoff networker" in the body of the email. Please write to 
networker-request AT listserv.temple DOT edu if you have any problems with this 
list. You can access the archives at 
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER