Exchange 2015 mailbox quota

In Exchange 2015, you can set the mailbox quota for a user or a group of users using the Exchange Management Console (EMC) or the Exchange Management Shell (EMS).

Using the Exchange Management Console (EMC)

1. Open the EMC and navigate to the "Recipients" node.
2. Select the user or group of users for which you want to set the mailbox quota.
3. Right-click on the user or group and select "Properties".
4. In the "User Properties" window, click on the "Mailbox Features" tab.
5. Under "Storage", click on the "Mailbox Quota" button.
6. In the "Mailbox Quota" window, select the desired quota value from the drop-down list or enter a custom value in the "Quota" field.
7. Click "OK" to save the changes.

Using the Exchange Management Shell (EMS)

1. Open the EMS and run the following command to set the mailbox quota for a user:

   Set-Mailbox -Identity <username> -ProhibitSendQuota <quota_value> -ProhibitReceiveQuota <quota_value> -WarningQuota <quota_value>

   Replace <username> with the actual username of the user, and <quota_value> with the desired quota value.

For example:

Set-Mailbox -Identity jsmith -ProhibitSendQuota 10GB -ProhibitReceiveQuota 10GB -WarningQuota 5GB

This command sets the mailbox quota for the user "jsmith" to 10GB for sending and receiving, and sets the warning quota to 5GB.

Quota values

The quota values you set will determine the following:

• ProhibitSendQuota: The maximum size of the mailbox that a user can send messages from.
• ProhibitReceiveQuota: The maximum size of the mailbox that a user can receive messages to.
• WarningQuota: The size of the mailbox at which the user will receive a warning message.

Note that these quota values are in addition to the default mailbox size limits set by your organization.