How do I monitor Exchange Online mailbox sizes?

These days, every organization depends on emails for communication. As an IT admin, you need to monitor Exchange Online mailbox sizes to keep an eye on space consumption and mailboxes reaching their size limits. Depending on the native tools for such varied information would eat into more than half of your average work day. PowerShell can help, but writing scripts can be a bit complex and time-consuming.


Exchange Reporter Plus, a reporting, change auditing, and monitoring solution for Exchange Servers and Exchange Online, can help you out with its Exchange Online size reports. These reports allow you to monitor: 

  • Mailbox sizes
  • Mailbox size restrictions
  • Current mailbox size vs. quota
  • Archive mailbox sizes
  • Mailbox storage information
  • Mailbox size over time

To access these reports:

  • Go to the Exchange Online tab.
  • Click the Mailbox Reports category.
  • Choose any report from the Size Reports sub-category.

Exchange Online mailbox size reports
Figure 1: Exchange Online mailbox size reports of Exchange Reporter Plus.

With these reports by your side, you can monitor mailbox sizes without struggling with the Exchange Online portal. 


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