Keeping Outlook365 window from collapsing

1. Core fixes
Disable automatic window management
Right-click Taskbar → Uncheck ‘Hide taskbar automatically’.
Outlook Options → Advanced → uncheck ‘Show separate items in taskbar’.
2. Window Layout Lock (Registry Method)
powershell
reg add HKCU\Software\Microsoft\Office\16.0\Outlook\Preferences /v DisableWindowResizing /t REG_DWORD /d 1 /f
3.Multi-Monitor Environment
powershell
# Force window memory location
reg add HKCU\Software\Microsoft\Office\16.0\Common\General /v DontRememberWindowPos /t REG_DWORD /d 0 /f
4. Optimise touch screen devices
Device Manager → Ergonomic Input Devices
Disable all ‘HID-compliant’ touch device test
5. Enterprise Deployment Configuration
xml
<Policy
  <WindowSettings>
    <OutlookWindowBehavior>
      <MinimizeOnClose>false</MinimizeOnClose>
      <RememberWindowSize>true</RememberWindowSize>
    </OutlookWindowBehavior>
  </WindowSettings>
</Policy>
Running HTML
6. Advanced Debugging Steps
Window Handle Analysis
powershell
Get-Process outlook | %{ $_.MainWindowHandle } | Out-GridView
7. GDI resource monitoring
powershell
perfmon /res # Check for GDI object leaks
8. Add-on conflict test
Safe mode startup: outlook.exe /safe
Gradually enable COM add-ons
9. Temporary alternatives
Use Powershell to keep windows
powershell
$wshell = New-Object -ComObject wscript.shell
while($true) {
  if (-not $wshell.AppActivate(‘Microsoft Outlook’)) {
    Start-Process outlook
  AppActivate(‘Microsoft Outlook’)) { Start-Process outlook
  Start-Sleep -Seconds 30
}
10. Third-party tool locking
WindowManager
Actual Window Manager