Microsoft gives Office 365 admins the heads-up: Some internal queries over weekend might have returned results from completely different orgs

Only in ‘extremely rare circumstances.’ So that’s OK

Microsoft had to warn a subset of Office 365 administrators over the weekend that their organisation might have inadvertently featured in an outsider’s internal search results.…

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Source: Theregister.co.uk/security / Article: "Microsoft gives Office 365 admins the heads-up: Some internal queries over weekend might have returned results from completely different orgs"