So what sort of data was leaked? The Microsoft Bing data leak appears to be generated by the Bing mobile app. It included search terms, location coordinates, device ID data, and a partial list of visited URLs. On the surface, it's all anonymous data, but earlier, similar leaks and data dumps have revealed that there may be some privacy implications here:
It seems Microsoft's leaked data may likewise have privacy implications. WizCase screenshots show that the records include fields called deviceID, deviceHash, AdID and clientID, all of which are promising in terms of finding all the searches from a particular user. There are also coordinates showing location "within 500 metres," not precise enough to get an address, but helpful to someone trying to identify searchers.Microsoft blames the data leak on a "misconfiguration".
The data also reveals some of the unsavoury things people search for, including illegal content. WizCase suggested that if criminals succeed in deanonymising the data, some individuals could be vulnerable to blackmail or phishing scams as a result.