Security News
Microsoft is investigating an issue that prevents Outlook and other email clients from connecting when using an Outlook.com account. "Since starting around 1/23/24 users have reported issues connecting with Outlook 2013, Outlook 2016, Outlook for Microsoft 365, Thunderbird, and mobile email apps when connecting with POP, IMAP, and Exchange connections," Microsoft says.
In a Monday advisory, Microsoft warned Outlook.com users about issues they might encounter when sending emails containing attachments. Outlook.com users impacted by this known issue are seeing "Error code 550 5.7.520 Message blocked" errors when trying to send emails.
Microsoft is investigating an ongoing issue preventing Outlook.com users from searching their emails and triggering 401 exception errors. "Our initial review of Outlook.com server logs, in parallel with HTTP Archive format logs captured during an internal reproduction of impact, indicates 401 errors are occurring due to an exception when users attempt to perform the search," Microsoft says on the service health portal.
Outlook.com is suffering a series of outages today after being down multiple times yesterday, with hacktivists known as Anonymous Sudan claiming to perform DDoS attacks on the service. This outage follows two major outages yesterday, creating widespread disruptions for global Outlook users, preventing users worldwide from reliably accessing or sending email and using the mobile Outlook app.
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Microsoft is investigating a recently discovered issue that causes deleted emails to reappear in the mail inbox of Outlook.com accounts. The exact cause behind these Outlook.com undeletable emails but the company says that it's working on a fix to be deployed when a resolution is available.
Between 1 January and 28 March this year hackers were able to access a “limited number” of consumer Outlook.com, Hotmail and MSN Mail email accounts, Microsoft has confirmed.
Hackers and Microsoft seem to disagree on key details of the hack.
Microsoft has declined to disclose how many users were affected by the breach, though the knock-on effects can be significant. Here's what professionals should do in the wake of the breach.