Outlook Signature Roaming Does Not Sync Between PCs: Fix

You have set up your email signature in Outlook on your work computer, but when you log into Outlook on another PC, the signature is missing or outdated. This happens because Outlook signature roaming relies on Microsoft 365 roaming settings, which can fail due to incorrect configuration or sync delays. This article explains why the sync breaks and provides step-by-step fixes to make your signatures appear on every device.

Signature roaming is a feature in Outlook for Microsoft 365 that stores your signatures in the cloud. When it works correctly, changes you make on one PC appear on all your other PCs within minutes. When it does not work, you waste time recreating signatures manually. The fixes below address the most common causes of sync failure.

Why Outlook Signature Roaming Fails to Sync

Outlook stores signatures locally in a folder on your PC. When you enable roaming, Outlook uploads your signature files to Microsoft 365 servers and downloads them to other devices. The sync process uses the Microsoft 365 Roaming Service, which is separate from mailbox sync. Several conditions must be met for this service to work:

First, you must be signed into Outlook with a Microsoft 365 work or school account that has the roaming feature enabled. Second, the Outlook client must be version 1904 or later. Third, the registry key that controls roaming must be present and set correctly. If any of these conditions are missing, the sync fails silently.

The Registry Key That Controls Roaming

Outlook checks a specific registry key to decide whether to use roaming signatures. The key is located at HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Setup. A DWORD value named RoamSignatures must be set to 1. If this value is missing or set to 0, Outlook ignores the roaming setting in the UI.

How the Sync Schedule Works

Outlook does not sync signatures in real time. The sync occurs every 15 minutes when Outlook is running and the computer is connected to the internet. If you close Outlook before the sync completes, the changes are not uploaded. This delay often confuses users who expect immediate synchronization.

Steps to Enable and Fix Outlook Signature Roaming

Follow these steps in order. After each step, check if the sync works by creating a test signature on one PC and seeing if it appears on the other PC after 15 minutes.

Step 1: Verify Your Outlook Version and License

1. Open Outlook
   Click File > Office Account. Under Product Information, check that it says Microsoft 365. If it says Outlook 2019, 2021, or perpetual license, roaming signatures are not supported.
2. Check the version number
   Click File > Office Account > About Outlook. The version must be 1904 or higher. If it is lower, run Windows Update or download the latest Office installer from the Microsoft 365 portal.

Step 2: Enable Roaming in Outlook Options

1. Open Signatures
   Click File > Options > Mail. In the Compose messages section, click Signatures.
2. Check the roaming checkbox
   At the bottom of the Signatures and Stationery window, check the box labeled Roam my signatures. Click OK twice to close all dialogs.
3. Wait for sync
   Keep Outlook open for at least 15 minutes. Do not close the application. After 15 minutes, check the other PC for the signature.

Step 3: Add or Fix the Registry Key

1. Open Registry Editor
   Press Windows key + R, type regedit, and press Enter. Click Yes if prompted by User Account Control.
2. Navigate to the Outlook Setup key
   Go to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Setup. If the Setup key does not exist, right-click the Outlook folder, select New > Key, and name it Setup.
3. Create or modify RoamSignatures
   Right-click in the right pane, select New > DWORD (32-bit) Value. Name it RoamSignatures. Double-click it and set Value data to 1. Click OK and close Registry Editor.
4. Restart Outlook
   Close and reopen Outlook. The registry change takes effect immediately.

Step 4: Rebuild the Outlook Profile

1. Open Mail in Control Panel
   Press Windows key + R, type control, and press Enter. Change the view to Large icons and click Mail (Microsoft Outlook).
2. Create a new profile
   Click Show Profiles > Add. Type a name for the profile and click OK. Enter your email address and password, then click Next. Wait for Outlook to set up the account.
3. Set the new profile as default
   In the Mail dialog, under When starting Microsoft Outlook, select Always use this profile and choose the new profile from the dropdown. Click OK.
4. Test the sync
   Open Outlook with the new profile. Create a signature and wait 15 minutes. Check the other PC.

If Outlook Still Has Sync Issues After the Main Fix

Signatures revert to an older version

If your signatures keep reverting to a previous version, the roaming service may be pulling an outdated copy from the server. Clear the cached signatures on both PCs. Close Outlook, then navigate to %appdata%\Microsoft\Signatures. Delete all files in this folder. Reopen Outlook and wait for the correct signatures to download from the cloud.

Roaming checkbox is grayed out

If the Roam my signatures checkbox is unavailable, your Outlook version or license does not support roaming. Verify you are using a Microsoft 365 Business, Enterprise, or Education plan with Outlook version 1904 or later. If you meet these requirements, the registry key may be missing. Follow Step 3 to add the RoamSignatures DWORD. After adding the key, restart Outlook and the checkbox will become active.

Signatures sync one way only

When signatures sync from PC A to PC B but not the reverse, the issue is usually a corrupt signature file on PC B. Delete the signature folder on PC B as described in the first issue. Then on PC A, edit the signature slightly and save it. This forces a new upload. After 15 minutes, check PC B again.

Roaming Signatures vs Local Signatures: Key Differences

Item	Roaming Signatures	Local Signatures
Storage location	Microsoft 365 cloud servers	Local PC hard drive
Syncing behavior	Syncs every 15 minutes across all signed-in devices	No sync; signatures stay on one PC only
Required license	Microsoft 365 Business, Enterprise, or Education	Any Outlook version including perpetual licenses
Registry dependency	Requires RoamSignatures DWORD set to 1	No registry key needed
Image support	Images embedded in signatures are synced as base64 data	Images are linked to local file paths

Now you can force Outlook to sync signatures by enabling the roaming option, adding the registry key, or rebuilding the profile. After applying the fix, create a signature on one PC and wait 15 minutes before checking the other device. If you use multiple Exchange accounts, note that roaming signatures apply only to the primary mailbox — you must configure secondary accounts separately.