GREAT NEWS! Exchange Online Archiving (EOA) is now available as add-on to any Enterprise Exchange Online plan.
What does this mean? Exchange Online Archiving (EOA), including In-Place hold and unlimited storage, was previously only available to be purchased as an add-on to on-premises Exchange Server 2010 mailboxes. Customers who wished to use Exchange Online mailboxes and required In-Place hold (or Litigation hold as it is sometimes called) were required to purchase Exchange Plan 2 (or E3/E4.) With this enhancement, Exchange Online Archiving (EOA) can now be purchased as an add-on to any Exchange Online plan, including Kiosk and Plan 1.
Specifically, Exchange Online Archiving (EOA) is now available as an add-on for Enterprise K1,K2, E1, A2, G1, and Exchange Online Plan1, Exchange Online K SKUs at a cost of $3.00 per user license per month.