We can check the current mailbox size of a mailbox in the Exchange Admin Center:
If that is the case, then we can easily increase the limit of the mailbox within the current plan. So it’s possible that your mailbox is still assigned an old limit. So if your mailboxes were created before 2016 then it’s possible that your mailboxes still have the old limits, 25Gb instead of 50Gb for Exchange Online plan 1 and 50Gb instead of 100Gb for plan 2.Īlso when you have upgraded your Office 365 plan to E3, for example, then the mailboxes may still have the old mailbox size limit. Microsoft has increased in the mailbox limitation in the past, in 2013 and later again for the E3 and E5 plans. When auto-expanding is turned on, the archive will incrementally increase to the max of 1.5TB.
Office 365 Mailbox Sizeīefore we are going to take a look at how to increase the mailbox size, let’s first check what the maximum size is in your Microsoft 365 plan: Microsoft Office 365 Planġ The initial archive size is 100GB. In this article, we are going to take a look at the default mailbox sizes in Office 365 and how to increase them.
Increase Mailbox size Office 365 with PowerShell.
