"Open other users Inbox" Greyed Out in OWA


I am using Exchange 2010 and OWA.  I can open a second users mailbox by clicking on my login name in the top right and selecting "Open Other Mailbox" but if i right click my login name in the left hand pane above "Inbox" the option to "Open other users Inbox" is greyed out.

Any ideas?

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George-Connect With a Mentor Author Commented:
OK, bit weird.

Opened OWA on the Exchnage server to and fine.
Opened OWA on laptop over VPN to internal IP range and second mailbox is now shown and "open other mailbox" no longer grayed out.
disconected VPN and opened OWA to https://externaladdress/OWA and all fine now.

Not sure why it had to be opened localy the first time.

THanks for your help.
AmitIT ArchitectCommented:
What browser you are using? Check with IE
George-Author Commented:
IE9.  Does not look like an IE issue.
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AmitIT ArchitectCommented:
I am able to view at my end. Right click at your name and then see if that option is showing up or not.
AmitIT ArchitectCommented:
I am using Firefox
George-Author Commented:
It is greyed out.
Manpreet SIngh KhatraConnect With a Mentor Solutions Architect, Project LeadCommented:
Hope no addon is affecting .... can you tell if the issue is reproducable on a different machine with the same account

- Rancy
George-Author Commented:
Opening on another machine fixed but i dont know why.
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