Getting Large Exchange Mailbox Folders With PowerShell

I’ve been continuing my quest to identify users who have large Exchange mailboxes. I wrote a function in my last post to find large Exchange mailboxes, but, I wanted to take this a step further and identify the large folders within user mailboxes that could stand to be cleaned out. For instance, maybe I want to find all the users who have a large Deleted Items folder or Sent Items or Calendar. You get the idea. It’s made to be run from a Remote Exchange Management Shell connection instead of by logging into an Exchange server via remote desktop and running such a shell manually. Remote administration is the future (just like my last post)!

So, let’s define the function and parameters.

My function is going to be named Get-LargeFolder and takes three parameters. $FolderScope is used in the Get-MailboxFolderStatistics cmdlet (spoiler alert) and must belong to the set of values specified. $Top is an integer used to define how many results we’re going to return and $Identity can be specified as an individual username to examine a specific mailbox, or left blank (defaulted to *) to examine the entire organization.

Now I’ve added a couple lines to get all the mailboxes in my organization (or a specific user’s mailbox) which I pipe into a Get-MailboxFolderStatistics command with the FolderScope parameter set to the same value we passed to our function. Now we need to sort the results, but, see my last post for why that’s going to be complicated.

The FolderSize parameter that comes back with a Get-MailboxFolderStatistics cmdlet is a string which I’m splitting up in order to get back only the value in bytes which I am casting to a double. Now that we have gathered our stats and put them in order, I just need to select them so they may be returned. Here is the complete script.

Now you can do this.