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Title
"Could not connect to mailboxDetails: Microsoft Exchange is not available. Either there are network problems or the Exchange computer is down for maintenance" -
Description
When attempting to open a Target Live Mailbox you receive the following error:
"Could not connect to mailbox <MAILBOX_DN> Details: Microsoft Exchange is not available. Either there are network problems or the Exchange computer is down for maintenance"
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Cause
Connecting account running Recovery Manager for Exchange does not have Full Mailbox Access on the target mailbox. Account requires Full Access, Send As and Receive As permissions over the Mailbox.
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Resolution
Review the permissions of the logged on account running Recovery Manager for Exchange and ensure it have Full Mailbox Access with Send As / Recieve As permissions to the mailboxes you are trying to open.
Note: If account is a member of the Domain Admins group then it may have explicit denys on the mailbox.
The following command has proven effective in working around permission inheritance by assigning full-access to each mailbox in the mailbox database to the service account:Get-Mailbox -Database DatabaseName | Add-MailboxPermission -User "UserName" -AccessRights FullAccess -InheritanceType All