Microsoft are going to Rolling Out a double capacity to Office 365 Mailboxes! It’s doubling the capacity.
The default mailbox size for Exchange Online E3 and E5 users is increasing from 50GB to 100GB. If a mailbox has been assigned a non-default quota (for any of the 3 quota values) then no change is made.
Tenants will be able to increase quotas up to 100GB.
You can see the change here – http://fasttrack.microsoft.com/roadmap#R-68127 and here – https://technet.microsoft.com/library/exchange-online-limits.aspx
