Microsoft Outage Explanation


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Mar 1, 2012
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[FONT=Segoe UI, Arial, Helvetica]On behalf of the entire team, I would like to extend my personal apology for any inconvenience you may have experienced last week with access to
We realize how critical your email is for staying in touch with your personal network and for being productive with the things you need to get done. And we are truly sorry for any issues you had in accessing We want you to know that has earned a leading reputation as a reliable and trustworthy email experience and to that end, we deeply investigate any issue to ensure that we fully understand the root cause and can prevent a similar occurrence in the future. And we pledge to you that we are dedicated to providing the reliable and trustworthy mail experience that you expect.
Many of you have asked and we would also like to provide a more detailed explanation of what happened last week that caused some of you to be temporarily unable to access your email. This incident was caused by a failure for some of our servers in the functionality that syncs information on some mobile devices using Exchange ActiveSync. The failure caused these devices to receive an error and continuously retry connecting with our service. This resulted in a flood of traffic that some of our servers did not handle properly, with the effect that many customers on those servers were unable to access their email.
In order to stabilize the impacted servers, we temporarily blocked access over Exchange ActiveSync for all of those servers and then worked to restore this gradually. Because of the significant backlog of traffic that had accumulated and in order to avoid another flood of traffic, we restored access slowly, meaning some of our mobile customers remained impacted for a longer period of time.
We have learned from this incident, and have made two key changes to harden our systems against future failure ? the most important is in updating the way we handle Exchange ActiveSync traffic to avoid a flood of requests hitting our servers and to ensure more reliable connections and the second involves increasing network bandwidth in the affected part of the system to ensure we have a greater capacity for these requests.
It is our goal to provide exceptional service to every person using, and I hope you will give us an opportunity to restore your confidence in Your support and dedication to our email service is very important to us. And so once again, on behalf of the entire team, I want to apologize for any inconvenience you experience and want to thank you for any patience you have shown us as we worked through the issues.
We look forward to your continued usage and hope to have the privilege of being your primary personal email service in the future.
[FONT=Segoe UI, Arial, Helvetica]Sincerely,

**** Craddock
Group Program Manager,

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