Issue:

When multiple people share a Microsoft 365 email account, their email signatures can get mixed up. This happens because Outlook automatically syncs signatures across computers.

Solution:

Turn off Outlook's signature sync feature. This lets each person keep their own signature when using a shared email account.

Option 1: Using PowerShell (Recommended)

Follow these steps to turn off signature sync for your computer:

Step 1: Open PowerShell

• Press Start
• Type "PowerShell" and click to open it

Step 2: Run the Commands

Copy and paste these commands:

New-Item -Path "HKCU:\SOFTWARE\Microsoft\Office\16.0\Outlook\Setup" -Force
Set-ItemProperty -Path "HKCU:\SOFTWARE\Microsoft\Office\16.0\Outlook\Setup" -Name "DisableRoamingSignaturesTemporaryToggle" -Type DWORD -Value 1

Step 3: Restart Outlook

• Close and reopen Outlook for the changes to work

Option 2: Using Registry Editor

1. Press Start, type "regedit", and open Registry Editor
2. Copy this path:
   

   HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Setup\

   And paste it into the address bar:
   
   
   Fig. 1. Navigating to the right location in Registry Editor
3. Right-click in the right window, select "New" then "DWORD (32-bit) Value"
   
   
   Fig. 2. Creating a new DWORD value
4. Copy this name:
   

   DisableRoamingSignaturesTemporaryToggle

5. Double-click it and set its value to 1
   
   
   Fig. 3. Setting the value to 1
6. Close Registry Editor and restart Outlook

Note: These changes only affect your current Windows user account.