Access right for owa in Exchange 2007

I am trying to access the e-mail of one of my user by going though OWA.  I have some 50 users and all ot them have no problem except this one.

I have attached the eror message in a word document along with this message.  I know it is a question of "Access rights" but I don't know to "What" and don't know how to fix it.

I have Exchange 2007 running on Windows server 2008 (64bits) in a VMware environment.
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AmitIT ArchitectCommented:
in exchange EMC console under the users properties, mailbox features tab, is outlook web access enabled?
Alain_HenriAuthor Commented:
After running:  Get-Mailbox nom_utilisateur | format-list ExchangeVersion  is got

ExchangeVersion : 0.1 (8.0.535.0)

I ran Set-Mailbox nom_utilisateur -ApplyMandatoryProperties anyway and the massage returned said nothing was changed.

I have verified the EMC and confirmed that the OWA is activated for that particular user.

Anymore suggestion?

By the way, thanks for answering so fast.
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AmitIT ArchitectCommented:
Is OWA working with user ID?
Alain_HenriAuthor Commented:
Try to temporary disable the account and then enable the account and connect it back to the mailbox. Seems like everything should be working so its worth a try.

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