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VarunAggarwal-9388 avatar image
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VarunAggarwal-9388 asked KaelYao-MSFT commented

Encryption and Decryption of Exchange Online Mailbox

Hello,

I am trying to understand how encryption and decryption of a mailbox works when using Azure Key Vaults to store the encryption keys

Here is the scenario

There are two azure subscriptions, both US based. There is a key provisioned in each key vault which will be used for encryption of data which resides in Office 365 for example Exchange Online. We create a data encryption policy using the two keys and apply the keys to Exchange online mailbox.

My questions are

  1. What is being encrypted the mailbox or each individual message in the mailbox ?

  2. How does outlook reads encrypted mailbox, does it gets decrypted when access by the mailbox owner

  3. How are these encryption keys read, are they read for every mailbox or are they cached ?

  4. what happens if the azure key vaults are down, will the users still be able to access their mailbox


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Hi @VarunAggarwal-9388

I am writing here to confirm with you how thing going now?
If you have any questions or needed further help on this issue, please feel free to post back.

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AndyDavid answered
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