Reset all Outlook profiles and update

Hello RaGau

Thank you for reaching out to Microsoft Q&A regarding your inquiry with Outlook application. Here the PowerShell and command-line tools for both Classic Outlook and the New Outlook app. These commands are safe to run and are designed to give Outlook a fresh start. This process will remove all configured email accounts, local cache, and settings, but it won't affect your server-side data. Please back up any important local files (such as PST files) before proceeding.

Notes Before Starting:

• Close Outlook completely before running any commands.
• Run PowerShell as your user account (not as administrator, unless specified).
• After resetting, restart Outlook to set up your accounts again.

For Classic Outlook:

# Kill Outlook process if running
Stop-Process -Name "OUTLOOK" -Force -ErrorAction SilentlyContinue
# Remove local Outlook files (OST, PST, etc.) - optional but recommended
Remove-Item -Path "$env:LOCALAPPDATA\Microsoft\Outlook\*" -Recurse -Force -ErrorAction SilentlyContinue
Remove-Item -Path "$env:APPDATA\Microsoft\Outlook\*" -Recurse -Force -ErrorAction SilentlyContinue
# Remove all profiles from registry (adjust 16.0 for your Office version)
Remove-Item -Path "HKCU:\Software\Microsoft\Office\16.0\Outlook\Profiles\*" -Recurse -Force -ErrorAction SilentlyContinue
# Optional: Disable first-run setup
New-ItemProperty -Path "HKCU:\Software\Microsoft\Office\16.0\Outlook\AutoDiscover" -Name "ZeroConfigExchange" -Value 1 -PropertyType DWord -Force -ErrorAction SilentlyContinue
Remove-ItemProperty -Path "HKCU:\Software\Microsoft\Office\16.0\Outlook\Setup" -Name "First-Run" -ErrorAction SilentlyContinue
# Launch Outlook to recreate default profile
Start-Process -FilePath "C:\Program Files\Microsoft Office\root\Office16\OUTLOOK.EXE"  # Adjust path if needed

For New Outlook:

Simple Command-Line Reset:

Run in Command Prompt: Olk.exe --clearLocalState

• This clears accounts and cache; confirm the dialog and restart the app.

Or in PowerShell:

# Close New Outlook
Stop-Process -Name "Olk" -Force -ErrorAction SilentlyContinue
# Delete local state files
Remove-Item -Path "$env:LOCALAPPDATA\Microsoft\Olk\*" -Recurse -Force -Exclude "logs" -ErrorAction SilentlyContinue
# Reset the app
Get-AppxPackage Microsoft.OutlookForWindows | Reset-AppxPackage
# Launch New Outlook
Start-Process -FilePath Olk.exe

Updating Outlook:

For Microsoft 365 installations, run this in Command Prompt as administrator to force an update:

"C:\Program Files\Common Files\microsoft shared\ClickToRun\OfficeC2RClient.exe" /update user displaylevel=false forceappshutdown=true

Or you could check for updates within Outlook: File > Office Account > Update Options > Update Now.

Hope this help. If you have any additional concern, feel free to comment below. I be more than happy to assist.  

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