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There are two ways to move such items to the archive mailbox – by either setting up an archiving policy or moving the items manually. It’s important to know that mailbox items from the primary mailbox do not flow automatically to the archives. All the archived data can also be found with eDiscovery. For users to be able to access the shared mailbox’s In-Place Archive, they need to be assigned explicit FullAccess permissions to the shared mailbox. Data stored in an archive mailbox is accessible and searchable by the user. Archiving in Microsoft 365Īrchive mailboxes are attached to other mailboxes. This way, you can retain data discoverability while preventing mailboxes from overloading. There are also 3 rd party backup & archiving tools, like CodeTwo Backup for Office 365, which let you decrease the amount of data kept in the cloud.

Exchange Online allows you to use retention policies to either retain or delete data automatically, based on the criteria you specify.

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It’s like with your standard hard drives – you can either get a new, larger one, or free up some of the used space. Increasing the maximum quota is not the only way to make more space available in mailboxes. Depending on your Microsoft 365 license, this will either give you additional 50 GB of space or nearly unlimited space with the auto-expanding archiving feature. This will increase the mailbox storage limit from 50 GB to 100 GB.

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Assign an Exchange Online Plan 2 license to the mailbox.There are two ways to increase the max mailbox size for a user: It’s not permitted to use journaling, transport rules or auto-forwarding for other mailboxes’ backup or archiving purposes. It’s still a lot of space, considering it’s reserved for a single user. This information is based on MC288051 from the Microsoft 365 message center. The word unlimited is now removed from their documentation. * since November 1, 2021, Microsoft introduces limits for auto-expanding archives: max size of 1.5TB total and max growth rate of 1 GB per day. To enable archiving for a shared mailbox, either of the mentioned license types needs to be assigned. By default, an archive mailbox has the 50 GB storage limit, but there is an option to have nearly unlimited (automatically expanding) archiving space* thanks to an Exchange Online Plan 2 license, or an Exchange Online Plan 1 license with an Exchange Online Archiving add-on license. Once the archiving feature is enabled, an archive mailbox is assigned to each mailbox separately. User and shared mailboxes’ storage space can be extended by an archive mailbox (In-Place Archive).However, when assigned an E3 or E5 license, they can store up to 100 GB of data. Shared mailboxes don’t require any license and have the standard, 50 GB size limit.Public folder mailboxes (in all subscription plans) have a limit of 100 GB.An F3 (Kiosk) license includes only 2 GB of storage and it doesn’t provide archive mailboxes. User mailboxes’ size limit can be increased up to 100 GB if assigned a Microsoft 365 E3 or E5 license (Exchange Online Plan 2).The maximum mailbox size for most mailboxes is 50 GB. You may find it useful if you’re planning to migrate from on-premises Exchange Server to Microsoft 365.

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This article shows what the maximum mailbox size is, how to increase mailbox size, how to check the current mailbox usage for all mailboxes and what to do to prevent mailboxes from reaching their size limit. Those limits depend on two variables: the subscription plan assigned to the mailbox and the mailbox type. Microsoft 365 (or to be more precise, Exchange Online) has certain mailbox size limits. Update: This post was updated on Octodue to new archiving limits

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