How much storage does each Zimbra account come with?
If you are installing ZCS on premise then storage is only limited by how much physical storage space you wish to allocate to each account (eg it can be unlimited, 10GB, 2GB, etc) depending on hardware constraints. The Administration Console allows your IT team to easily set up “Class of Service” for the accounts. If you wish to purchase a Zimbra account from a hosted service provider, they will determine how much storage will be allocated to you; typically based on industry norms.