Outlook Mailbox Access error

Fix: Mailbox access issues, it appears, could be resolved by setting an additional non-inherited Exchange Domain Server entry with just ‘Full Mailbox Access’ under (Active Directory) :  AD/SBS Users – Advanced Security Settings.

Note: that there should already be two other Exchange Domain Server entries but which are Inherited from ‘Parent Object’,
one with ‘Deny – Full Mailbox Access’, and a second with ‘Allow – Special’ (allows all except ‘Associated External account’)


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