A problem with Microsoft's Hotmail and MSN email service is preventing users from multiple providers from sending messages to the Microsoft email services.

Users of the mail application in Apple's OS X operating system on Monday started reporting that email messages addressed to Hotmail and MSN addresses weren't being delivered. The problem doesn't occur if a copy of the message is sent to the user's own account. Changing the priority setting from 'normal' to either 'high' or 'low' also provides a workaround, users reported on the forum.

Read more about MSN email server software problems at http://www.vnunet.com/vnunet/news/2144972/hotmail-outage-hits-apple.