In simple terms, think of Exchange Online Archiving mapping directly to the Compliance mailbox mentioned early on. Where confusion is common is when the capacity of Microsoft 365 Business Premium mailboxes is considered.Īs you can see from the above diagram, Microsoft 365 Business Premium is a little bit special because it takes a standard Exchange Online Plan 1 as discussed previously and adds something called Exchange Online Archiving. This 1.5TB capacity is provisioned by Auto expanding archive as mentioned previously per: Confirming this in the Exchange Online limits documentation : It has a 100GB primary mailbox and a 1.5TB max capacity archive thanks to the fact that the features of the Compliance mailbox are baked into these plans as shown above. Thus, the total mailbox capacity across primary and archive combined here will be 100GB for these plans.Ī Microsoft 365 Enterprise E3, E5, Office 365 E3, E5 or Exchange Online Plan 2 mailbox looks like: Will have a primary mailbox of capacity 50GB: So a user with Microsoft 365 Business Standard like so: The configuration for Microsoft 365 Business Basic, Business Standard, Office 365 E1 and Exchange Online Plan 1 stand alone look like:įor all these licenses you get a 50GB primary mailbox and a 50GB cloud only archive. Now the capabilities and capacities of each of these individual mailboxes is defined in the Exchange Online limits, which currently are: You can read about this in more detail here: Thus you start with 100GB and when you exceed that another 100GB is added and so on.
The process by which the Compliance mailbox is provided 1.5TB of storage is by adding 100GB blocks of space as required.
Primary mailbox = Can be synchronised to Outlook on the desktop and into an OST file.To better understand the mailbox capacities in Microsoft 365, think of an Exchange Online mailbox as potentially being made up of three distinct components like so:
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