You want your Outlook email signatures to appear the same on your work PC, home laptop, and any other Windows device you use. By default, Outlook stores signatures locally on each computer, so a signature you create on one machine does not show up on another. Microsoft provides a roaming signatures feature that syncs your signatures through Exchange Online or Microsoft 365 cloud storage. This article explains how to enable that sync and what you need to check for it to work.
Key Takeaways: Enable Roaming Signatures in Outlook for Microsoft 365
- Outlook for Microsoft 365 only: Roaming signatures require a Microsoft 365 Business or Enterprise subscription with Exchange Online mailboxes.
- File > Options > Mail > Signatures > Roaming Signature: The toggle in Outlook desktop that turns on cloud-based signature storage.
- Signatures folder in cloud mailbox: The underlying mechanism saves signatures as hidden items in your Exchange Online mailbox, not on the local drive.
What Roaming Signatures Do and What You Need
Roaming signatures store your Outlook email signatures in your Exchange Online mailbox instead of on the local hard drive. When you enable this feature, Outlook uploads your signature templates to a hidden folder in your cloud mailbox. Every time you open Outlook on a different Windows device signed in with the same Microsoft 365 account, the client downloads the signatures from the cloud. This means any change you make to a signature on one computer appears on all other devices within minutes.
The feature works only with Outlook for Microsoft 365 (version 2002 or later) connected to an Exchange Online mailbox. It does not work with on-premises Exchange Server, Outlook for Mac, Outlook for iOS or Android, or standalone Outlook 2021 or 2019 without a Microsoft 365 subscription. Your Windows device must be running Windows 10 version 1903 or later or any build of Windows 11.
The sync uses the same Exchange Web Services infrastructure that syncs other mailbox data. No third-party tools or additional licenses are required beyond your Microsoft 365 subscription. The feature is enabled by default in newer builds of Outlook for Microsoft 365, but you may need to verify the setting if you have an older version or custom group policy.
Steps to Enable Roaming Signature Sync in Outlook
Follow these steps to turn on roaming signatures. You must perform these steps on each Windows device where you want the signatures to sync. After enabling, create or edit a signature on one device and it will appear on the other devices within a few minutes.
- Open Outlook and go to File > Options
Launch Outlook on your Windows device. Click the File tab in the upper-left corner, then click Options at the bottom of the left pane. This opens the Outlook Options dialog box. - Select Mail and click Signatures
In the left pane of Outlook Options, click Mail. Under the Compose messages section, click the Signatures button. This opens the Signatures and Stationery dialog box. - Enable the roaming signature toggle
At the top of the Signatures and Stationery dialog box, look for the option labeled Roaming Signature or Store my signatures in the cloud. The exact text may vary by Outlook build. Check the box or toggle the switch to On. If you do not see this option, your Outlook version may not support roaming signatures. Update Outlook for Microsoft 365 to the latest build. - Click OK to save and close all dialogs
Click OK in the Signatures and Stationery dialog box, then click OK in the Outlook Options dialog box. Outlook now saves new and edited signatures to your Exchange Online mailbox. - Create or edit a signature on one device
On the device where you just enabled roaming, create a new signature or edit an existing one using the same Signatures button under File > Options > Mail. Click OK to save. The signature is uploaded to the cloud automatically. - Verify sync on another Windows device
On a second Windows device signed into the same Microsoft 365 account, open Outlook and go to File > Options > Mail > Signatures. The signature you created on the first device should appear in the list. If it does not appear immediately, wait 5 minutes and restart Outlook.
If Roaming Signatures Are Not Syncing
The roaming signature toggle is missing from Outlook Options
If you do not see the Roaming Signature or Store my signatures in the cloud option in the Signatures and Stationery dialog box, your Outlook version is likely older than version 2002, or you are using a non-subscription version such as Outlook 2021 or 2019. Update Outlook for Microsoft 365 to the latest build by going to File > Office Account > Update Options > Update Now. If you are using a perpetual license, roaming signatures are not available.
Signatures do not appear on the second device after enabling
Wait at least 5 minutes after saving a signature on the first device. Outlook syncs signatures asynchronously and the delay is normal. Close and restart Outlook on the second device. If the signature still does not appear, check that both devices are signed into the same Microsoft 365 account and that the account has an Exchange Online mailbox. You can verify the mailbox type by going to File > Account Settings > Account Settings and looking at the Type column for your email address — it must say Exchange.
Changes to signatures are lost after restarting Outlook
This usually means the roaming signature feature was turned off after you saved the signature, or the sync failed due to network issues. Re-open the Signatures dialog and confirm the roaming toggle is still enabled. If the toggle is off, turn it on again and re-save your signature. Check your internet connection and ensure Outlook can connect to Exchange Online. If the problem persists, run the Microsoft Support and Recovery Assistant (SaRA) tool and select Outlook for Windows > I have an issue with signatures.
Roaming signatures work on one device but not on another
Each Windows device must have the roaming signature feature enabled individually. The toggle is per-client, not per-mailbox. Go to the device that is not syncing and follow the steps in the previous section to enable the toggle. Also confirm that the Outlook version on that device is build 2002 or later and that it is signed into the same Microsoft 365 account.
Cached Exchange Mode vs Online Mode: Impact on Signature Sync
| Item | Cached Exchange Mode | Online Mode |
|---|---|---|
| Default signature storage | Local OST file plus cloud mailbox | Directly in Exchange Online mailbox |
| Roaming signature sync behavior | Signatures sync via cloud mailbox; local OST caches them after download | Signatures sync directly; no local cache delay |
| Required for roaming signatures | Works with Cached Exchange Mode enabled or disabled | Works with Online Mode; no additional steps needed |
| Performance impact | No noticeable impact on signature sync speed | Same as Cached Exchange Mode for signatures |
Roaming signatures work regardless of whether you use Cached Exchange Mode or Online Mode. The signatures are stored in the cloud mailbox and downloaded by Outlook on each device. If you switch between modes, signatures continue to sync without any reconfiguration. The only requirement is that the roaming signature toggle is enabled on each device.
After enabling roaming signatures, you can create multiple signatures and assign them to different email accounts or reply behaviors using the same Signatures dialog. The sync covers all signatures you create, including those with images, tables, and formatted text. Images must be hosted on a web server or embedded as inline attachments; the sync does not convert local file paths to cloud paths.
To test the sync quickly, create a new signature on your primary device with a unique phrase such as Test Sync. Save it, then open Outlook on another device and check the signature list. If it appears, the feature is working. If you later disable the roaming toggle, signatures remain in the cloud mailbox but are no longer synced to that specific device. You can re-enable the toggle to resume syncing without losing existing signatures.