The psOutlook module has a few functions that will enable you to analyze outlook.
Examples:

• Get-OutlookFolderCount: allows you to get counts of folders within a mailbox. You can supply the root folder and if needed a list of specific subfolders you want a count.
• Get-OutlookSenders: Get a count of who is sending you emails
• Get-OutlookUnReadCount: Get a count of unread emails per folder

• PowerShell V3+
• Outlook - have not verified all versions, works with 2016.

Get-OutlookFolderCount -root "Wes.Stahler@osumc.edu" | Out-GridView

# define our list of folder that we want numbers from
$folders = '\\Spam Reporting (OSUWMC)\Inbox\Non Report SPAM\',
'\\Spam Reporting (OSUWMC)\Inbox\Report Phish Reports\By Date\',
'\\Spam Reporting (OSUWMC)\Inbox\Report Phish Reports\eusafe\',
'\\Spam Reporting (OSUWMC)\Inbox\Report Phish Reports\safe\'

Get-OutlookFolderCount -root "Spam Reporting (OSUWMC)" -folders $folders| Out-GridView

• Wes Stahler @stahler

• Finish MD file
• Convert to module
• Add help
• Verify error handling
• Add more functions
  • Frequent Senders
  • Unread email per folder
  • Warning on count