SharePoint Online: Find All Unused Sites based on Last Modified Date
Requirement: Get All Unused SharePoint Online Sites
How to Find the Last Modified Date of SharePoint Online Site Collections?
The modern SharePoint Online Admin center gives a neat view of all sites in the tenant along with the “Last Activity (UTC)” column that gives a date value when List Items or Files viewed/edited/shared in the site.
PowerShell to Find Unused Sites in SharePoint Online
Let’s find the Last Modified Date value of a given site using PowerShell.
#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
#Variables
$SiteURL ="https://crescent.sharepoint.com/sites/marketing"
Try {
#Setup Credentials to connect
$Cred= Get-Credential
#Setup the context
$Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
$Ctx.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)
#Get the Web
$Web = $Ctx.web
$Ctx.Load($Web)
$Ctx.ExecuteQuery()
#Get the last modified date of the web
Write-host "Last Modified:"$Web.LastItemUserModifiedDate
}
Catch {
write-host -f Red "Error:" $_.Exception.Message
}
LastItemModifiedDate vs LastItemUserModifiedDate: There is a difference between the LastItemModifiedDate and LastItemUserModifiedDate. The LastItemUserModifiedDate property is a timestamp that reflects changes made by user accounts. “LastItemModifiedDate” property is the timestamp of changes made by the system.
Let’s modify this script a bit to retrieve the last modified date value of all subsites of the given site collection.
#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
#Variables
$SiteURL ="https://crescent.sharepoint.com/sites/marketing"
#Get Credentials to connect
$Cred= Get-Credential
Function Get-SPOSiteLastModified($SiteURL)
{
Try {
#Setup the context
$Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
$Ctx.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)
#Get the site
$Web = $Ctx.web
$Ctx.Load($Web)
$Ctx.ExecuteQuery()
#Get the last modified date of the site
Write-host "Last Modified Date of $($SiteURL):"$Web.LastItemUserModifiedDate
#Get Subsites of the site
$Webs = $Web.Webs
$Ctx.Load($Webs)
$Ctx.ExecuteQuery()
ForEach($SubWeb in $Webs)
{
#Call the function to get subsite's last modified date
Get-SPOSiteLastModified $SubWeb.URL
}
}
Catch {
write-host -f Red "Error:" $_.Exception.Message
}
}
#Call the function to get last modified date of a site and its subsites
Get-SPOSiteLastModified $SiteURL
Get Inactive SharePoint Online Sites using PowerShell
How about finding inactive SharePoint site collections in the tenant?
#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
#Variables
$AdminSiteURL ="https://crescent-admin.sharepoint.com"
$CSVFile = "C:\Temp\SiteData.csv"
#Get Credentials to connect
$Cred= Get-Credential
#Connect to Admin Center
Connect-SPOService -Url $AdminSiteURL -Credential $Cred
#Get All Site Collections
$Sites = Get-SPOSite -Limit All
$SiteData = @()
#Loop through each site collection
ForEach($Site in $Sites)
{
Write-host -f Yellow "Getting Data for Site:" $Site.URL
Try {
#Setup the context
$Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($Site.URL)
$Ctx.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)
#Get the Root Web
$Web = $Ctx.web
$Ctx.Load($Web)
$Ctx.ExecuteQuery()
#Get the last modified date of the site
$SiteData += New-Object PSObject -Property @{
SiteTitle = $Web.Title
URL = $Web.Url
LastModified= $Web.LastItemUserModifiedDate
}
}
Catch {
write-host -f Red "Error:" $_.Exception.Message
}
}
#Export the results to CSV
$SiteData | Export-CSV $CSVFile -NoTypeInformation
Here is the SharePoint Online inactive sites report.
PnP PowerShell to Get Unused Site Collections in the past 30 days
We’ve “LastContentModifiedDate” property available at site collection level. Let’s use PnP PowerShell to get the modified date in SharePoint Online.
$TenantAdminURL = "https://Crescent-Admin.SharePoint.com"
$TenantURL = "https://Crescent.SharePoint.com"
$DaysInActive = 30 # number of days to check since last modified
$CSVPath = "C:\Temp\InactiveSites.csv"
#Connect to Admin Center
Connect-PnPOnline -Url $TenantAdminURL -Credentials $Cred
#Get All Site collections - Exclude BOT, Video Portals and MySites
$SiteCollections = Get-PnPTenantSite -Filter "Url -like $TenantURL -and Url -notlike '-my.sharepoint.com/' -and Url -notlike '/portals/'"
#Calculate the Date
$Date = (Get-Date).AddDays(-$DaysInActive).ToString("MM/dd/yyyy")
#Get All Site collections where the content modified
$InActiveSites = $SiteCollections | Where {$_.LastContentModifiedDate -le $Date} | Select Title, Url, LastContentModifiedDate, Template, StorageMaximumLevel
#Export to CSV
$InActiveSites
$InActiveSites | Export-Csv -Path $CSVPath -NoTypeInformation
How could use it with MFA? It getting an errors
For MFA, Instead of “-Credentials” parameter, use “-UseWebLogin”.
Connect-PnPOnline -Url $TenantAdminURL -Credentials $Cred
Use:
Connect-PnPOnline -Url $TenantAdminURL -UseWebLogin
You’ll get a popup to enter your credentials which is MFA aware.
If you are not an Admin Site in each site, but you are a Global Admin, the script get an error
That’s obvious! Doesn’t matter if you have Global Admin or SharePoint Online Admin rights, But you must add your account as “Site collection Admin” on all sites first. How to Add Site Collection Admin to All Sites in SharePoint Online?
Amazing, thank you for that!
Just for your info, in the PnP script, the var $TenantURL is empty. You’re getting an error back: “Get-PnPTenantSite : Value for property Url does not contain a valid value.”
Fixed it! Thanks.