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. 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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