Our customer is asking for below feature regarding the mail store which is avalible in Exchange :

Common data store for group of email IDs ---> For example, 100 GB disk size will be allocated to group 10 email IDs and we wont mentioned any specific mailbox quota to any of this email ID..customer will use this 100 GB disk quota as per their requirement...

I think in Exchange, it work on database level.. is it possible in Zimbra ? If yes how to do that ...i search in forum and wiki but couldnt find out any related stuff...

Please confirm.