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SingleItemRecoveryEnabled flag in Exchange Hybrid

ExUser44 61 Reputation points
2021-02-16T04:55:03.877+00:00

Hi Team,

Just wanted to know if SingleItemRecoveryEnabled flag is set to true when a mailbox is migrated from Exchange Online to Exchange On-premise.

As per my understanding, when a mailbox is created in Exchange On-premise, single item recovery is disabled by default. But when the mailbox is created in Exchange Online, it is enabled by default.

During our analysis in Hybrid, we could see that when a mailbox is migrated back from Exchange Online to Exchange On-premise, SingleItemRecoveryEnabled flag is set to true. Is this expected? Since the mailbox is now in On-premise, shouldn't it be disabled?

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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  1. Andy David - MVP 147.9K Reputation points MVP
    2021-02-16T13:35:31.94+00:00

    From a compliance stand-point, that makes sense. Exchange will retain that setting when a mailbox is moved.
    I tested this and confirmed the same thing you do. Once enabled, if I move it back on-prem, SingleItemRecoveryEnabled is still set to $true
    This ensures that if you do move a mailbox, all the recoverable items are there even if moved back on-prem.

    If that is not needed, then it can set to $false of course :)

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