You have a library of custom email signatures in the classic Outlook desktop app. The new Outlook for Windows is a modern application with a different underlying architecture. This means your existing signature files are not automatically transferred when you switch. This article provides the steps to manually copy your signatures from the classic app to the new Outlook client.
Key Takeaways: Migrating Outlook Signatures
- File Explorer navigation to %appdata%\Microsoft\Signatures: Locates the folder where classic Outlook stores all your signature HTML, TXT, and RTF files.
- New Outlook Settings > Compose and reply > Email signature: Opens the signature editor where you can paste or recreate your signatures in the new application.
- Manual copy and paste of HTML code: Ensures complex formatting, images, and links from your old signature are preserved during the migration.
Understanding the Signature Storage Difference
The classic Outlook desktop program stores signature files locally on your Windows PC. These files are kept in a hidden system folder and are managed directly by the Outlook application. Signatures can exist in three formats: HTML for rich formatting, Plain Text, and RTF for specific font styles.
New Outlook, which is based on the Outlook for the web codebase, handles signatures differently. It stores signature data within your mailbox settings on the Microsoft 365 server or within the app’s local database. There is no direct file system import feature. Therefore, migration is a manual process of locating the old files and recreating the signatures in the new interface.
What You Need Before Starting
You must have both the classic Outlook app and the new Outlook for Windows installed on the same computer. Ensure you know which email account in classic Outlook uses which signature for new messages and for replies. It is also helpful to send a test email from classic Outlook to yourself to see the exact final rendering of your signature before you copy it.
Steps to Copy Signatures to New Outlook
The core process involves finding the signature files on your computer and then manually entering their content into the new Outlook signature editor. Follow these steps in order.
- Open the classic Outlook signatures folder
Close Outlook completely. Press Windows key + R to open the Run dialog. Type%appdata%\Microsoft\Signaturesand press Enter. This opens File Explorer directly to the folder containing your signature files. - Identify and open your signature files
You will see files named after your signatures, like “Professional.htm”, “Professional.txt”, and “Professional.rtf”. For the best formatting, right-click the .htm file and choose “Open with” then select Notepad or another text editor. This shows the HTML code. - Copy the signature content
In the text editor, select all the text and code by pressing Ctrl + A, then copy it with Ctrl + C. If your signature uses a local image, note the image file’s location in the code; you will need to upload it separately. - Paste into new Outlook
Open the new Outlook app. Click the Settings gear icon in the top-right corner. Select “Mail” and then “Compose and reply”. Find and click the “Email signature” section. Click “+ New signature”, give it a name, and in the editing box, paste your copied HTML code with Ctrl + V. - Re-add images and set defaults
If your signature had an image, you must upload it again. Click the image icon in the signature editor toolbar, upload the file, and resize it if needed. Finally, use the dropdown menus to set this new signature as the default for new messages and for replies/forwards for the correct account.
Common Mistakes and Limitations to Avoid
Manually transferring signatures can lead to formatting errors or missing elements if not done carefully. Be aware of these specific pitfalls.
Signature Looks Different in New Outlook
The new Outlook editor uses a different rendering engine. Complex HTML tables or CSS styles from classic Outlook may not display identically. After pasting, review the signature in the preview pane and use the new editor’s formatting toolbar to adjust fonts, colors, and alignment manually. Avoid copying from the .txt file as it will lose all formatting.
Images or Logos Do Not Appear
Classic Outlook often embeds images using a local file path on your C: drive. This path is not valid in new Outlook. You must save the image file to a known location, then use the “Insert picture” button in the new signature editor to upload it. The image will then be stored with your signature data.
Multiple Account Signatures Get Mixed Up
In the new Outlook signature settings, you must explicitly assign a signature to each email account for new messages and for replies. Do not just create one signature. Create a separate signature entry for each account, even if they are similar, and use the dropdown menus under each account name to assign them correctly.
Classic vs New Outlook Signature Management
| Item | Classic Outlook | New Outlook |
|---|---|---|
| Storage Location | Local folder (%appdata%\Microsoft\Signatures) | Cloud-based (mailbox settings) or app data |
| File Format | Separate .htm, .txt, .rtf files | Single unified HTML entry per signature |
| Editing Interface | Dedicated Signatures and Stationery dialog | Inline editor in Settings > Compose and reply |
| Image Handling | Links to local files or embedded attachments | Requires upload via the editor; stores with signature |
| Account Assignment | Per-account settings in the same dialog | Per-account dropdown menus in signature list |
You can now use your professional email signatures in the new Outlook application. Test your setup by composing a new message and replying to an existing one. For advanced formatting, use the new editor’s “Insert link” tool to recreate any hyperlinks that may not have transferred. Remember that changes made in new Outlook will not sync back to the classic app.