This article explains how to find and monitor used storage across Microsoft 365 and Google Workspace environments. Covered services include: Email (Exchange / Gmail), OneDrive / Google Drive, SharePoint / Sites, Teams / Chat, and Calendar.
Microsoft 365 (O365)
Microsoft 365 Admin Center provides detailed usage reports within the Reports → Usage section. Admins can view storage consumption across Exchange, OneDrive, and SharePoint.
SharePoint Storage Report
Path: Microsoft 365 Admin Center → Reports → Usage → SharePoint
→ Storage tab
This report shows total and available tenant storage, growth trends, and
capacity projections.
SharePoint storage overview in the Microsoft 365 Admin Center.
Mailbox Usage (Exchange Online)
Path: Microsoft 365 Admin Center → Reports → Usage → Email
Activity → Exchange → Mailbox Usage
Displays active vs. total mailboxes, storage used (GB/TB), and quota status
(Good, Warning, Prohibit Send/Receive).
Exchange Online Mailbox Usage Report — Storage and Quota Charts.
OneDrive Usage Report
Path: Microsoft 365 Admin Center → Reports → Usage → OneDrive
→ Usage tab.
Shows total and active accounts, file counts, and storage used (MB/GB/TB).
OneDrive Usage Report with storage trend chart.
View and Manage OneDrive Storage (Desktop)
Users can check their personal OneDrive space via: OneDrive App → Help & Settings → Settings → Manage Storage
Accessing OneDrive storage settings from the desktop client.
Manage Storage from OneDrive Web
On the OneDrive web portal, view the current usage and largest files by clicking Manage Storage under the Storage section.
OneDrive web view with storage details and largest files option.
Mailbox Storage Widget (Outlook Web App)
Users can check mailbox storage through: Outlook Web App → Settings → General → Storage
Mailbox storage indicator in Outlook Web App settings.
SharePoint Admin – Storage Overview
Admins can view total and available tenant space from: SharePoint Admin Center → Active Sites
SharePoint storage overview showing total and available capacity.
Mailbox Storage Trend (Alternative View)
Another view under Reports → Usage → Mailbox Usage shows historical storage usage over 7, 30, 90, or 180 days for capacity tracking.
Mailbox storage trend in Microsoft 365 Admin Center.
How to Check the Total Storage Usage of Your Google Workspace
This section shows how to check total storage usage in Google Workspace.
Steps
- Sign in to the Google Admin Console.
- Go to Reporting → Reports → Apps Reports → Accounts.
- Scroll to the bottom and review Storage used by apps and Total storage used for your domain.
- Optionally, download the storage details to a Google Sheet or CSV for analysis.
Domain-wide storage (Total storage used & Storage used by apps).
Summary Table
| Platform | Location | Report Type | Data Shown |
|---|---|---|---|
| Microsoft 365 | Admin Center → Reports → Usage → Exchange → Mailbox Usage | Per-user mailbox storage and quota | Storage and usage per mailbox |
| Microsoft 365 | Reports → Usage → OneDrive | OneDrive usage report | Files, active users, storage used |
| Microsoft 365 | SharePoint Admin Center → Active Sites | Storage overview | Tenant and site storage limits |
| Google Workspace | Admin Console → Reports → Storage Used | Admin storage summary | User storage by service |
| Google Account | https://one.google.com/storage | Personal account view | Breakdown by Gmail, Drive, Photos |
References
- Mailbox Usage – Microsoft Learn
- OneDrive Usage – Microsoft Learn
- SharePoint Storage Report – Microsoft Learn
- Google Workspace Storage Usage – Google Support
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