Dears, We installed exchange 2007 on clustered Mailbox servers using Windows cluster failover feature that comes with Windows 2008 before 5 months ago. Today, I have checked Hard disk (let’s say Drive E :) on both mailbox servers where mailbox data have been stored, I found both Mailbox folders on both servers have different size (the deference is 55 GB) ,any idea about this difference, do they (Mailbox folder on both server) have to be the same size?. thanks