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.
