Mailbox Size Limits
The amount of mailbox storage available to a user is determined by his or her user subscription license:
· Each Exchange Online Kiosk user receives 500 MB of mailbox storage. The maximum mailbox size for a Kiosk user is 500 MB.
· Each Exchange Online (Plan 1) user receives 25 GB of mailbox storage, which can be split between the user’s primary mailbox and the user’s personal archive.
· Each Exchange Online (Plan 2) user receives 25 GB of storage in the user’s primary mailbox. The maximum size of the primary mailbox is 25 GB. The user also receives unlimited storage in the user’s personal archive (see the personal archive section of this document for details).
Administrators can use Remote PowerShell to reduce maximum mailbox sizes for some or all of their users. This is achieved by adjusting the mailbox capacity alerts described in the following paragraphs.
Special mailbox types, such as conference rooms and shared mailboxes, have different size limits. These limits are detailed in the relevant sections of this document.
Mailbox Capacity Alerts
Exchange Online provides three notifications to users as their primary mailboxes approach maximum size limits:
· Warning: Users receive email warnings when their mailboxes are approaching the maximum size limit. This warning is intended to encourage users to delete unwanted mail.
· Prohibit Send: Users receive email prohibit-send notifications when they reach their mailbox size limits. Users cannot send new messages until they delete enough messages so that their mailboxes are below the size limit.
· Prohibit Send/Receive: Exchange Online rejects any incoming mail when this limit is reached and then sends a non-delivery report (NDR) to senders. Sender can try resending the mail later. To receive messages, users must delete messages until the mailbox is below the size limit.
These values can be modified using Remote PowerShell, as described in the help topic Set Mailbox Quotas in Office 365 using Windows PowerShell. Table 7 shows the default values.
Mailbox size limits and notifications
| Mailbox type | Warning | Prohibit Send | Prohibit Send/Receive |
| Exchange Online Kiosk | 450 MB | 475 MB | 500 MB |
| Exchange Online (Plan 1) | 24.5 GB | 24.75 GB | 25 GB |
| Exchange Online (Plan 2) | 24.5 GB | 24.75 GB | 25 GB |
These limits and notifications are for the user’s primary mailbox. The personal archive has a separate, non-configurable quota.
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