Changing Mailbox quota for a Zimbra 8.x (mailbox) Account
To change a Zimbra 8.x (mailbox) Account quota:
1- Login to your webmail account: https://
using the email admin email address and password.
and click on the "Admin Console" link at the top right of the page,
login directly to the Zimbra Admin page at: https://:7071/
2- Click on Manage then Accounts to see a list of the mailboxes in the domain you manage.
3- Select the account you want to work with, and double-click on Edit to edit it.
4- Click on the Advanced Tab.
5- Change the value in the field "Account quota (MB):" in the Quotas section
6- Click on the Save button on the top left part of the page.