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How to Determine Amount of Storage Used in Office 365

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Office 365 Exchange Online

Use the following steps to determine the amount of storage used in Office 365 Exchange Online:

  1. Log in to your Office 365 environment as administrator, and select Admin > Reports:
    adminreports.png
  2.  In the Mail section, click Mailbox Usage:
    mailboxusage.png
  3. In the Mailbox usage graph, click the Total number of users column:
    clickcolumn.png
  4. The list of users displays; click download csv file to download the list to your local system as a .csv file:
    downloadcsv.png
  5. Navigate to and open the downloaded .csv file in Microsoft Excel.
  6. create a formula in Excel to calculate the sum of the Space used (KB) column:
    excelformula.png
  7. Convert the sum from KB to either GB or TB depending on your preference. This amount is the total storage used by each end-user mailbox. 

Office 365 OneDrive for Business

Use the following steps to determine the amount of storage used in Office 365 OneDrive for Business:

  1. Log in to your Office 365 environment as administrator, and select Admin > Reports:
    adminreports.png
  2. In the OneDrive for Business section, click OneDrive for Business storage:
    onestorager.png
  3. The OneDrive for Business storage graphs display the amount of storage used in MB for a 12-, 24-, or 52-week, period:
    onedriveused.png

SharePoint Online

  1. Log in to your Office 365 environment as administrator, and go to the SharePoint admin center.
  2. In the left pane click site collections.
  3. In the Site Collections table, review Percent Used:
    SharePointStorage.png

 

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