I am trying to move a mailbox from one user account to another within a single AD domain. We are using Exchange 2007. I have followed these steps:

1. Disable the account
2. From "Disconnected Mailbox" container, connect to the new account
3. I get a success message

When I try to login to OWA using the new user account, I get this message:

Outlook Web Access could not connect to Microsoft Exchange. If the problem continues, contact technical support for your organization.

Request Url: https://mail.somedomain.com:443/owa/default.aspx User host address: 1.2.3.4

Exception Exception type: Microsoft.Exchange.Data.Storage.ConnectionFailedTransientException Exception message: Cannot open mailbox /o=cgsexchangeorganization/ou=exchange administrative group (fydibohf23spdlt)/cn=recipients/cn=someuser.

NOTE: I changed some identifying information for security purposes.

I have tried multiple times and get to the same place. When I login to OWA with old account, I get an error that the mailbox cannot be found, which makes total sense. Does anybody have any ideas on this? Thanks!