It turns out that setting a personal email signature in the Outlook.com web panel isn’t the same as setting it in Office 365 OWA. Don’t panic though – it’s still pretty easy:
1. Log in to your Outlook.com account, click the small gear icon in the upper-right corner, next to your username and select More mail settings (Fig. 1).
Fig. 1. Gear icon and More mail settings option.