Exchange Online mailbox sizes are increasing


Tim Tetrick
Cloud Partner Technology Strategist

I am excited to announce that mailbox sizes in Exchange Online and Office 365 are increasing.  User mailboxes will be doubling in size – from 25GB to 50GB, and even Kiosk mailboxes will be doubling from 1GB to 2GB.  In addition, Shared mailboxes are moving from 5GB to 10GB, and Resource mailboxes are moving from 250MB to 10GB!

The best part is that there is no price increase associated with this change and you and your customers don’t need to do anything to take advantage of this.  The mailbox sizes will automatically increase starting immediately and will continue to roll out through November.

Here is a summary of all the new mailbox sizes by plan:


The Exchange Online Service Description’s Exchange Online Limits page will be updated in the very near future to reflect this change.

I encourage you to share this news with your new and existing customers as evidence of Microsoft’s commitment of continuously delivering value to its Office 365 customers.

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