On November 13, some Microsoft Office 365 customers in North America were reporting (via Twitter and email) that they were experiencing email problems -- just like they were five days ago.
A Microsoft spokesperson provided the following update around 2 pm ET today:
"On Tuesday, Nov. 13, some customers served from our North America data centers are experiencing intermittent access to e-mail services. Customers are being updated regularly via our normal communication channels. We sincerely apologize to our customers for any inconvenience."
It's not immediately clear what's causing today's issue or what Microsoft is doing to head off more email-centric Office 365 outages. I've asked and will update this post with any further details if and when I hear back.
Update: 6 pm ET on November 13. The Office 365 team tweeted that the issue has been resolved.
No word (still) from Microsoft about why this happened again or what the team is doing to head off email issues of this nature going forward.
Update No. 2 (November 14): Microsoft posted a blog entry detailing more about what caused the two outages. An antivirus issue caused the November 8 email issues, according to the post. Yesterday's was due to a combination of maintenance, "network element" and load issues. The post also details steps Microsoft officials said they are taking to prevent these kinds of problems in the future.
A couple of folks commented at the end of the new post that they consider Microsoft's health dashboard to be inadequate for monitoring service status when outages occur. Microsoft has been using its Twitter account to provide status updates during the last few outages.