Microsoft Cortana will be a voice activated virtual assistant for Windows Phone, similar to Apple’s Siri, and now references to Cortana have appeared on Bing.
The photo below is of the personalization page for Microsoft’s Bing, and it mentions Microsoft Cortana, you can see a description of what Bing will use Cortana for below the photo.
Clear personal info
When you’re signed into your Microsoft account, Microsoft services like Cortana, Bing Apps, and Bing services personalize your experience. This personalization will be impacted when you clear the information below and will be reflected on all devices where you have authenticated with your Microsoft account.
This will clear your saved favorites and interests in Cortana and related Bing apps and services.
Other Cortana data
To provide personalized recommendations, we upload some info from your Windows Phone, such as your calendar, contacts, location, and browsing history. If you clear this info, Microsoft may be temporarily unable to provide these recommendations.
Microsoft are expected to release Windows Phone 8.1 to developers this week at their BUILD conference, and it is expected to launch as an OTA update some time in May.
Source Nokiapoweruser, Ubergizmo