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Powershell/PowerShell-Office365Admin/OneDrive/IncreaseOneDriveQuotaAll.ps1

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+# Increase the size of all users' OneDrive for Business accounts
+#
+# Requires the Sharepoint Online PowerShell module to be installed
+#
+
+# The name of your Office 365 organization
+# This can be found in your Sharepoint URL before the '-my', eg: https://thecompany-my.sharepoint.com/
+$spoTenantName=''
+
+# The size you want to increase to in TB.
+$newSize = 1
+
+# Connect to Sharepoint Online
+Import-Module Microsoft.Online.SharePoint.PowerShell -DisableNameChecking
+Connect-SPOService -Url ('https://' + $spoTenantName + '-admin.sharepoint.com')
+
+# Create the common base URL for OneDrive for Business
+$spoBaseWildcard = 'https://' + $spoTenantName + '-my.sharepoint.com/personal/*'
+
+# Convert new size to bytes
+$newBytes = $newSize * 1048576
+
+# Get a list of all personal sites within the tenant.
+$personalSites = Get-SPOSite -Limit all -IncludePersonalSite $true | Where-Object {$_.Url -like $spoBaseWildcard}
+
+# Increase size for each user in turn.
+foreach ($personalSite in $personalSites) {
+    $spoURL = $personalSite.Url
+    $userUPN = $personalSite.Owner
+    $currentBytes = $personalSite.StorageQuota
+
+    if ($currentBytes -lt $newBytes) {
+        try {
+            Set-SPOSite -Identity $spoURL -StorageQuota $newBytes -ErrorAction:Stop
+            Write-Output -InputObject ('Updated OneDrive account limit for ' + $userUPN + ' to ' + $newSize + 'TB.')
+        }
+        catch {
+            Write-Output -InputObject ('Failed to update OneDrive account limit for ' + $userUPN + '.')
+        }
+    }
+    else {
+        Write-Output -InputObject ('OneDrive account limit for ' + $userUPN + ' already equal to or higher than ' + $newSize + 'TB.')
+    }
+}