Cannot access another users mailbox via OWA 2013

Question

Hello
I have just migrated a few users from Exchange 2010 to Exchange 2013.
If I try and access their mailboxes via OWA 2013 using "open another users mailbox" I receive the following error:
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X-OWA-Error: SDServerErr;Microsoft.Exchange.Data.Storage.AccessDeniedException
X-OWA-Version: 15.0.995.28
X-FEServer: EX2013
X-BEServer: EX2013.company.local
Date: 07/11/2014 11:23:46I can still access any mailbox on a 2010 server via the same method.
Can anyone assist in resolving this issue please?
Matt

Answer 1

Hi Amy,
Yes Inheritance is enabled.
Just to clarify this is affecting ALL mailboxes once moved to Exchange 2013, not specific users.
There are multiple 2013 databases all with mailboxes on. Each databases is displaying the same behaviour.
Here are the permissions I have checked so far:
ADSI Edit: CN=Databases,CN=Exchange Administrative Group (<>),CN=Administrative Groups,CN=Company
,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=domain,DC=localnet
The AD group has inherited Full Control on all of the database objects.
EAC: The AD group has full control on every migrated mailbox
EMS: The AD group has the following permissions on all mailbox databases:
Identity User                                           IsInherited   Deny  AccessRights
MDB01  Company\AD Group                         True         False     {GenericAll}
I have removed permissions for the group and re-added them, this has made no difference.
The only way I can access any of the migrated mailboxes is to explicitly grant my account "Full Access" via the Add-MailboxPermission command.
Regards
Matt