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Exchange | Exchange Server | Management
The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.
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Unless you have changed the default value for deleted mailbox retention, you will only have 30 days to restore a mailbox:
When you delete a mailbox, Exchange retains the mailbox in the mailbox database and switches the mailbox to a disabled state. The associated Active Directory user account is also deleted. The mailbox is retained until the deleted mailbox retention period expires, which is 30 days by default, and then it's permanently deleted (or purged) from the mailbox database.
You may want to see if you have any backups of the Exchange Server from 9-10 months ago.
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