I'm trying to write script that can tell me the last login of all users. Also I'm trying to see what the how much mail space each in my organization is using.

I'm trying to write script that can tell me the last login of all users. Also I'm trying to see what the how much mail space each in my organization is using.  I wrote a script that looks like this.... Get-Mailbox |Get-MailboxStatistics.  The Storage Limit column is empty and I'm going to need information there