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From a customer perspective, once you enable expandable archives, you can’t move these mailboxes back to on-premises servers because Exchange Server doesn’t support the feature. Very large archives caused other concerns, such as the amount of time required to move mailboxes with large archives between mailbox databases or servers (Microsoft commonly rebalances mailbox load across Exchange Online servers).
#Office 365 plans archive
Microsoft reserves the right to deny unlimited 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. Microsoft says “ A user’s archive mailbox is intended for just that user. This led to the current guidance that an expandable archive is purely for personal use and cannot grow at more than 1 GB/day.
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Operational IssuesĪfter getting past the deployment issues, Microsoft discovered other operational problems, like the way some migration projects took the opportunity to move vast amounts of data from legacy archiving systems to Exchange Online, often using shared mailboxes as the archive target.
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As you might expect, the new technology met some deployment challenges and full implementation across the service didn’t happen until 2017. Roll on to 2016, and Microsoft started to enable expandable archives in customer tenants.
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In other words, it’s harder for a tenant to move off Office 365. Auto-expanding archives also delivered a real advantage over the capabilities available to competitors like Google, and it didn’t hurt Microsoft to increase the amount of customer data in Office 365. The advent of the bottomless archive was a nice story which supported Microsoft’s Office 365 Import Service to help customers move PST files to Exchange Online. The expansion process happens automatically without any need for the user to intervene. As information is added to the archives, Exchange Online automatically monitors the storage and if the archive gets within 10% of its limit, it adds an extra 50 GB “chunk” of storage to the chain of physical shards (storage locations) which formed the logical archive mailbox. User mailboxes start off with 100 GB archives while shared mailboxes start with 50 GB. The original blog post held out promises of a “ truly bottomless archive.” The new feature allowed users with the necessary licenses (Office 365 E3 and above or Exchange Online Plan 2, or even an Exchange Online archiving license) to stuff as much information as they wanted into their archive mailbox. Microsoft announced “ auto-expanding, highly scalable archiving” for Exchange Online on June 3, 2015. Bottomless Archives Terminate on November 1