How to add another users mailbox account to the available accounts in exchange 2007 OWA

We have users who need to add additional users mailboxes to their mail view in outlook web access. We do not see any options to do this.
in the desktop  client, we go to account settings, advanced and add another mailbox.

One blog indicated we do this from clicking on the user name in the upper right corner of the OWA screen. Our OWA screen does not show the user name.

Please advise how to achieve getting additional mailboxes visble on our web client.
thank you
wlasnerDirector, ITAsked:
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AmitIT ArchitectCommented:
In OWA, right click at the root or username. Select other user mailbox. Provide the mailbox name and open it. Check this
Make sure you use Internet Explorer.  

If I access 2007 OWA via something like Chrome, I don't get the option...
wlasnerDirector, ITAuthor Commented:
OK, the IE made a difference. We now have the name and the drop down option. I already have access to the administrator mail box under my desktop client. Yet, in OWA it tells me  "You do not have permission to open this mailbox. For access or for more information, contact technical support for your organization."  
I have owner permissions
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AmitIT ArchitectCommented:
Goto EMC. Find the user, right click and take full permission. Wait for sometime and then open again.
Michael MachieIT SupervisorCommented:
To clarify Amit's instructions you would:

Go to Exchange Management Console -> Recipient Configuration -> Mailbox
In the list of mailboxes, R-Click on the User you want to add access to -> select 'Manage Full Access'
In the search list type the name of the User to GRANT Full Access to -> and then OK then Finish

This will grant the User you selected in the search list FULL access to the mailbox you want to grant access to. Keep in mind that it will not only grant access in OWA but will also automatically populate the User's Outlook with the Mailbox access was granted for.

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wlasnerDirector, ITAuthor Commented:
No option for security or permissions when going to properties for a user mailbox in MMC?
Michael MachieIT SupervisorCommented:
@wlasner: whose comment were you replying to?

If you have Domain, or Enterprise, permissions assigned to your account you will definitely see the 'Manage Full Access' option.
wlasnerDirector, ITAuthor Commented:
You guys are great! Got it. Thank you. I was not on the server, remove EMC does not allow that function.
wlasnerDirector, ITAuthor Commented:
Thank you
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