When your organization sets up an email account in Microsoft 365, you're automatically given an onmicrosoft.com domain. But spammers are abusing the system, so Redmond is cracking down.

Windows giant takes aim at spammers exploiting new 365 tenants Microsoft has issued a warning to companies using the ...

Hackers stole up to $15 million from April to September by spoofing legitimate Microsoft Email Office 365 email addresses. Senior executives in around 150 companies were impersonated.  ...

Microsoft Outlook is an email platform featuring calendars, contacts, file-sharing, and more. Microsoft folded MSN and Hotmail into Outlook years ago.

Microsoft is working to resolve an Exchange Online issue causing email access problems for Outlook mobile users who use Hybrid Modern Authentication (HMA).

Microsoft is introducing new limits for onmicrosoft.com domains. Organizations can now send a maximum of 100 external emails ...

Microsoft is limiting free onmicrosoft email domains to 100 messages a day, pushing businesses toward custom domains.

When Microsoft 365 customers attempted to email an address at @att.com, @sbcglobal.net, or @bellsouth.com, AT&T servers would refuse the connection and not accept the email for delivery.