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Showing posts from November, 2015

On Premise Mailbox user missing in Exchange Online GAL

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Ran into an interesting issue with one of our Exchange Online customer. Thought it probably worth sharing with the solution I found. The customer has an Exchange Hybrid setup. Recently some of  Office 365 Exchange Online users complain they cannot email to a particular on premise mailbox: [email protected] m . The user bascialy does not show up in Exchange Online GAL. The on premise mailbox is working fine and other on premise staff can send emails to it without issue. When I checked Exchange Online, I cannot find the contact object for this account. Initially I thought it could be for some reason the user's on premise AD object has not been synced properly to Office 365. So I tried with recreating the object in Office 365 by moving the on premise AD account to a non-synced OU. This delete the user's Office 365 account. Then I move the on premise account back into its original OU. After re-sync the account back into Office 365, it still refuse to show up in Exchange O