Powershell

The following script will use the user’s AD city and the default gateway to determine if a user is in their home office or visiting an office. If the script determines that the user is not in their home office, it will automatically disable Outlook caching and vice versa for a user that is in their home office.

In order for the script to work, you will need to use the cities listed in AD for your $CurrentLocation switch. Similar to the example below, you will also have to copy your default gateways inside of the switch.

<#  

.SYNOPSIS  
    Caches a user's mailbox based on machine type or location  

.NOTES  
    File Name  : OutlookCaching.ps1  
    Author     : Jose Espitia
    Requires   : PowerShell V5
    Version    : Version 1.00

#>
if($env:COMPUTERNAME -like "*-D") {    
    # Get Default Gateway
    $CurrentDefaultGateway = (Get-WmiObject Win32_NetworkAdapterConfiguration) | foreach { $_.DefaultIPGateway }

    # Find Machine's Location
    $CurrentLocation = switch ($CurrentDefaultGateway) { 
            10.101.1.1 {"Orlando"} 
            10.102.1.1 {"Miami"} 
            10.103.1.1 {"Atlanta"} 
            10.104.1.1 {"New York City"}
            10.105.1.1 {"Denver"}
            10.106.1.1 {"Austin"}
            10.107.1.1 {"Los Angeles"}
            10.108.1.1 {"Las Vegas"}
            10.109.1.1 {"Seattle"} 
    }

    # Get User's Info
    $objSearcher = New-Object System.DirectoryServices.DirectorySearcher
    $objSearcher.SearchRoot = New-Object System.DirectoryServices.DirectoryEntry
    $objSearcher.Filter = "(&(objectCategory=User)(SAMAccountName=$env:USERNAME))"
    $objSearcher.SearchScope = "Subtree"
    $obj = $objSearcher.FindOne()
    $UsersHome = $obj.Properties["l"]

    # Determine if user is in their home office
    if($UsersHome -match $CurrentLocation) {
        cmd /c REG ADD "HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Outlook\Cached Mode" /v Enable /t REG_DWORD /d 1 /f
    }
    else {
        cmd /c REG ADD "HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Outlook\Cached Mode" /v Enable /t REG_DWORD /d 0 /f

    }
}

The script below will block users in a specified OWA Policy from creating Office 365 groups. The script uses Out-GridView to allow you to select which OWA Policy you want to assign this rule to.

#Office 365 Credentials
$username = "USERNAME"
$password = "PASSWORD"

try {
    #Attempts to connect to Office 365 and install Modules
    Import-Module MSOnline
    $pass = convertto-securestring -String "$password" -AsPlainText -Force 
    $credential = new-object -typename System.Management.Automation.PSCredential -argumentlist $username, $pass
    Connect-MsolService -Credential $credential -ErrorAction Stop
    $ExchangeSession = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "https://outlook.office365.com/powershell-liveid/" -Credential $credential -Authentication "Basic" -AllowRedirection
    Import-PSSession $ExchangeSession >null
}
catch [Microsoft.Online.Administration.Automation.MicrosoftOnlineException] {
    #Logs error for incorrect password
    Write-Host "Please verify your username and password"
    Write-EventLog -LogName Application -Source "Office 365 Log" -EntryType Error -EventId 1 -Message "OFFICE 365 AUTOMATIC LICENSE ASSIGNMENT`n`nError Connecting to Office 365! Please verify your user name and password"
    exit
}

catch {
    #Log for any other error
    Write-Host "Error Connecting"
    Write-EventLog -LogName Application -Source "Office 365 Log" -EntryType Error -EventId 1 -Message "OFFICE 365 AUTOMATIC LICENSE ASSIGNMENT`n`nError Connecting to Office 365!"
    exit
}
$OWA = Get-OwaMailboxPolicy | Select Identity | Out-Gridview -Title "Select one or more OWA Policies" -PassThru | foreach { $_.Identity } 
if($OWA.count -eq 0) {
    Write-Host "Please rerun the script and select an OWA Policy"
}
else {
    if($OWA.count -gt 1) {
        foreach($MultiOWA in $OWA) {
            Set-OwaMailboxPolicy -Identity $MultiOWA -GroupCreationEnabled $False
        }
    }
    else {
        Set-OwaMailboxPolicy -Identity $OWA -GroupCreationEnabled $False
    }    
}