Outlook

New Outlook and Outlook on the web

Copy your Sigxel signature. Open Settings → Accounts → Signatures, select the account, and create a signature. Paste into the editor, choose defaults for new messages and replies, and save. Older web interfaces may show Mail → Compose and reply instead.

Classic Outlook for Windows

Open a new message, then Message → Signature → Signatures. Add a signature and paste it into the editor. Select the email account and defaults for new messages and replies. Confirm with OK.

Check the result

Send a test message. Some Outlook versions change fonts and image corners. Your desktop and web installations may need separate setup.

Source: Microsoft's Outlook signature guide.