Microsoft Advertising Rolls out IF Functions to Everyone
https://about.ads.microsoft.comMicrosoft Advertising IF functions is now available globally for all Microsoft Advertisers. IF functions are specific parameters that are used in expanded text ads for the search network, so when a person is searching for something and the conditions are met, the parameter is replaced by the text you specify, thus allowing you to customize your ads to show specific text based on what potential customers are searching for. More info in their help documentation.
You can create and manage IF functions via the Feed Management Tool in the UI and with their bulk API.