Exchange 2007 Mail box and Calendar connection issue


We have an issue that we cannot connect to any shared calendars or mailboxes.  I have given myself full permissions to the mailbox and when I add it to my Outlook I get a message that states:

The set of folders cannot be opened.  Microsoft Exchange is not available.  Either there are network problems or the Exchange server is down for maintenance

If I try  connect to the test users calendar then I get a message that it is read only.

For this user I gave myself full access to the mailbox for testing an issue where we have shared calendars under user accounts and they are no longer accessible for any of our users
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MB ShaikhCommented:

Once you give the permission at the server box for the user to read the mailbox, then check the calender permission at the client side from the outlook, there are more granular permissions you can manage at client side, like owner, read, write etc.

Hope it will solve the issue.

MB Shaikh
thomasm1948Author Commented:
OK, I just tried to log into the account and opened OWA and it tried to sign in and it says that it cannot find the mailbox for the user.  When I open exchange management console, I see the mailbox.

When I open Outlook under the username then I receive the following error

The name cannot be resolved, the name cannot be matched to a name in the address list
thomasm1948Author Commented:
I found out the issue.  Someone decided to remove the readonly permission for AuthenticatedUSers in one of the AD OUs and that disabled Exchange from reading from it.

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thomasm1948Author Commented:
thank you
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