As Exchange Administrator, if you want to find out any user’s mailbox size information by folder and number of items in each folder, you can to the right place. Here is the PowerShell Command to list the folders, number of items in the folder and size of the folders.
Replace the username@domain.com with user’s primarySMTPAddress.
(Get-MailboxFolderStatistics -Identity Username@Domain.com) |sort itemsinfolder -descending |ft folderpath,itemsinfolder,FolderSize
The results will look like this:
FolderPath ItemsInFolder FolderSize ---------- ------------- ---------- /Inbox/Important_email 1907851 2.661 GB (2,857,213,378 bytes) /Junk E-Mail 461173 1.801 GB (1,933,977,887 bytes) /Inbox/S - Archived/KIRA 15085 539.8 MB (566,024,075 bytes) /Deleted Items 12202 418.3 MB (438,663,132 bytes) /Recoverable Items 9109 56.48 MB (59,219,680 bytes) /Calendar 3276 127.2 MB (133,343,630 bytes) /Inbox/1 - Archived/Munchkins 2558 48.49 MB (50,848,487 bytes) /Sent Items 1355 45.74 MB (47,961,704 bytes) /Inbox/0 - YOps Mist 1339 389.1 MB (408,029,942 bytes) /Inbox/1 - Archive 1147 118 MB (123,761,904 bytes) /Inbox/5 - Alerts 929 33.92 MB (35,571,617 bytes) /Inbox/1 - Archive2 920 142.1 MB (149,002,073 bytes)
Anand, the Architect 