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In-Place Archive size & Mailbox size

Anonymous
2018-04-19T17:47:46+00:00

Hello,

We have Exchange Online Plan 1 for all our users for a few years. This Plan gives each of our user a mailbox storage size of 50GB.  About a year ago, I enabled the In-Place Archive feature for an user to see how it works out.  Recently, I looked at the usage size of the user's mailbox and his in-place archive mailbox size and found one thing odd to me.

The admin portal shows that the user's archive usage is 5.29GB (i.e., 10% of 50GB size limit, see screenshots below).  However, the user's overall mailbox usage is only 2.87GB (5% of 49.5GB).  It seems that the 2 numbers don't add up.  I thought the archive mailbox is a subset of the general mailbox.  Please advise.

Also, the status of the archive mailbox is "local archive created".  What does that mean?  The user's in-place archive mail folders are actually accessible online at Office 365/ OWA (the third screenshot).

Thank you for any input.

Microsoft 365 and Office | Subscription, account, billing | For home | Windows

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  1. Anonymous
    2018-04-19T20:44:50+00:00

    Thank you for the quick reply.  So, I am wrong.  The archive mailbox is not a subset of the general mailbox.  From the reference you provided, therefore, for Exchange Online Plan 1 that we have, a user will have 50GB regular mailbox size plus 50GB archive mailbox - a total of 100GB storage size limit.  The total mail size for this user is 8.16GB.

    Thanks again!

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  1. Anonymous
    2018-04-19T20:09:51+00:00

    Hello Fred,

    The user mailbox and the archive mailbox both have 50 GB size(for your subscription). Once the items have been moved to the archive mailbox, they will not exist in the user mailbox. By default, after the archive mailbox is enabled, the emails are older than 2 years are automatically moved to the archive mailbox due to the default retention policy. So it is an expected behavior that the user mailbox is 2.87 GB and the archive mailbox is 5.29 GB. You can see the 2 articles for reference: Exchange Online Limits & Archive mailboxes in Exchange Online.

    The status just means that you have enabled In-place archive for this user mailbox and this user is using the archive mailbox. If you still have any questions, please feel free to contact us.

    Regards,

    Rick

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