Office 365 Exchange Online New Mailbox Size
Default Mailbox size increasing for E3 and E5
Microsoft has recently announced increasing the default quota for Exchange Online mailboxes from the previous 50 GB limit. The last change was from 25 GB to 50 GB in 2013. New mailbox size upgrade will be in 2019 or 2020.
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.
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