Microsoft has suffered an outage of its Exchange Online hosted email service that impacted users in the Asia Pacific region.
"Investigating Exchange Online issue in APAC," Microsoft posted on its Office365 Twitter account.
"Some will not be able to connect to email. Resolving ASAP."
Microsoft urged users to check the Office365 service status dashboard for updates. The dashboard was available to registered Office365 users only.
Microsoft's primary Australian Office365 reseller Telstra referred questions on the outage to Microsoft.
A Microsoft Australia spokesman declined to comment, referring users to look at the internal dashboard.