On the heels of a trove of 773 million emails, and tens of millions of passwords, from a variety of domains getting leaked in January, Microsoft has faced another breach affecting its web-based email services.

Microsoft has confirmed to TechCrunch that a certain “limited” number of people who use web email services managed by Microsoft — which cover services like @msn.com and @hotmail.com — had their accounts compromised.

Microsoft is still recommending that affected users change their passwords regardless.

The breach occurred between January 1 and March 28, Microsoft’s letter to users said.

Once identified, those credentials were disabled.

Microsoft told users that it didn’t know what data was viewed by the hackers or why, but cautioned that users might as a result see more phishing or spam emails as a result.

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