When viewing the archive portion of the folder list in Outlook, these subfolders are displayed under the original folder. Sometimes when a folder is moved, one or more subfolders are automatically created and items from the original folder are distributed to these folders to facilitate the moving process. Microsoft 365 determines which folders get moved when additional storage is added to the archive. To make efficient use of auto-expanding archive storage, folders may get moved. What gets moved to the additional archive storage space? Microsoft reserves the right to deny additional archiving in instances where a user's archive mailbox is used to store archive data for other users or in other cases of the inappropriate use. Using journaling, transport rules, or auto-forwarding rules to copy messages to an archive mailbox is not permitted. A user's archive mailbox is intended for just that user. It can take up to 30 days for the additional storage space to be provisioned.Īuto-expanding archiving is supported only for mailboxes used for individual users (or shared mailboxes) with a growth rate that doesn't exceed 1 GB per day. When the archive mailbox (including the Recoverable Items folder) reaches 90 GB, it's converted to an auto-expanding archive, and Microsoft 365 adds storage space to the archive until it reaches a maximum size of 1.5 TB.
An archive mailbox with 100 GB of storage space is created, and the warning quota for the archive mailbox is set to 90 GB.Īn administrator enables auto-expanding archiving for the mailbox. This process happens automatically, which means administrators don't have to request additional archive storage or manage auto-expanding archiving.Īrchiving is enabled for a user mailbox or a shared mailbox. This process continues until the user's archive reaches a size 1.5 TB. If the user runs out of this additional storage space, Microsoft 365 adds more storage space to the user's archive. When an archive mailbox gets close to its storage limit, Microsoft 365 automatically creates additional storage space for the archive. When auto-expanding archiving is enabled, Microsoft 365 periodically checks the size of the archive mailbox. How auto-expanding archiving worksĪs previously explained, additional mailbox storage space is created when a user's archive mailbox is enabled. To enable the archive for a shared mailbox, an Exchange Online Plan 2 license or an Exchange Online Plan 1 license with an Exchange Online Archiving license is required. Auto-expanding archiving also supports shared mailboxes.
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