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  ARM Give a man a fire and he's warm for a day, but set fire to him and he's warm for the rest of his life (Terry Pratchett, Jingo)

Oops, they did it again: Microsoft breaks Outlook with another dubious update

(2025/03/20)


Users of Microsoft's email service might be feeling a distinct sense of déjà vu after the web version of Outlook last night blocked access to Exchange Online mailboxes.

[1]According to Microsoft, the problem was due to "a recent change made to a portion of Outlook on the web infrastructure, that may have resulted in impact."

Reverting the change [2]did the trick , and service was restored, but the question must be asked – does Microsoft test its changes before deploying to production?

[3]

The problems, according to DownDetector, began around 1730 UTC on March 19 and appeared to be worldwide. The company admitted to them via social media shortly after, [4]saying : "We're investigating reports of an issue affecting users' ability to access Outlook on the web."

[5]

[6]

Half an hour later, the company admitted it made a change that might be responsible. That change was [7]reverted , and services started returning to normal.

[8]Eight days later, Microsoft Outlook users still struggle on iOS devices

[9]Still can't get to your Outlook mailbox? You aren't alone

[10]iOS users left refreshing in vain as Microsoft Outlook woes drag on

[11]Microsoft blames Outlook's wobbly weekend on 'problematic code change'

This sort of incident is becoming depressingly commonplace. A lengthy outage occurred at the [12]beginning of March which Microsoft also blamed on some dodgy code.

Enterprise administrators are the ones truly suffering. Yes, users are finding email access suddenly blocked, yet it is the administrator who is on the front line. If the company has gone all-in on Microsoft's cloud email services, that poor admin can do little more than place a support call and raise a ticket with the cloud provider.

The issue also highlights the complexity and scale of cloud services, where one wrong move by an engineer can result in an outage for tens of thousands of customers. The only way to mitigate this is through rigorous testing and a thorough understanding of the change's implications.

[13]

The Register asked Microsoft how it validates its changes and what assurance it could give customers that this issue won't be repeated. The company is yet to respond. ®

Get our [14]Tech Resources



[1] https://x.com/MSFT365Status/status/1902438243653836837

[2] https://x.com/MSFT365Status/status/1902449801951678588

[3] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_software/applications&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=2&c=2Z9xK8NFJjItPH3TcefAcEQAAAMQ&t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0

[4] https://x.com/MSFT365Status/status/1902432009927987460

[5] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_software/applications&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44Z9xK8NFJjItPH3TcefAcEQAAAMQ&t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0

[6] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_software/applications&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=3&c=33Z9xK8NFJjItPH3TcefAcEQAAAMQ&t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0

[7] https://x.com/MSFT365Status/status/1902449801951678588

[8] https://www.theregister.com/2025/03/11/outlook_ios_problems/

[9] https://www.theregister.com/2025/03/06/outlook_outage_day_5/

[10] https://www.theregister.com/2025/03/05/outlookcom_ios/

[11] https://www.theregister.com/2025/03/03/microsoft_outlook_outage/

[12] https://www.theregister.com/2025/03/03/microsoft_outlook_outage/

[13] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_software/applications&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44Z9xK8NFJjItPH3TcefAcEQAAAMQ&t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0

[14] https://whitepapers.theregister.com/



That _is_ the answer!

Joe W

"The Register asked Microsoft how it validates its changes and what assurance it could give customers that this issue won't be repeated. The company is yet to respond."

Saying f'all means they'll do f'all.

Get me one of those.... --->

I'm preparing for a meeting, or rather should be (instead I'm reading ElReg).

Re: That _is_ the answer!

Chloe Cresswell

"The Register asked Microsoft how it validates its changes and what assurance it could give customers that this issue won't be repeated. The company is yet to respond."

Maybe they asked by email? ;)

Re: That _is_ the answer!

Anonymous Coward

Microsoft are still trying to copy Apple.

They'll start by blanking El Reg. Then they'll make things even more expensive. Making products somewhat reliable is a long way down the list.

Microsoft was founded

Omnipresent

50 years ago and still can't do email.

Re: Microsoft was founded

gv

"If the company has gone all-in on Microsoft's cloud email services"

Re: Microsoft was founded

Chloe Cresswell

To quote a.s.r.

All software evolves till it can send email... except for microsoft exchange.

The Central Scrutinizer

"According to Microsoft, the problem was due to "a recent change made to a portion of Outlook on the web infrastructure, that may have resulted in impact."

Reverting the change did the trick, and service was restored, but the question must be asked – does Microsoft test its changes before deploying to production?"

My derision for Microsoft knows no bounds. lolol as they say in the classics.

m4r35n357

Still their customers continue to fund this ineptitude. Karma.

"Testing? We've heard of it"

Bebu sa Ware

Probably no skilled staff left to do the testing.

Outlook QA Manager: "Can you guys stop banging aways at those keyboards? You are never going to manage Hamlet. Give us hand over here."

Re: "Testing? We've heard of it"

bombastic bob

From article: does Microsoft test its changes before deploying to production?

They USED to...

The testing department got "mostly pink-slipped" about a year before Win-10-nic released, according to grok. The tester to developer ratio was dropped from 2:1 to about 1:1, and the developer role apparently became "tester/developer" (or similar). They BASICALLY decided to rely on insiders, home users, etc. to validate their "cram it up your xxx" forced updates before getting the enterprise users updated. THAT has been their new model, ever since.

Looks like rain

Alex 72

The orange, rasi winning, former entertainer, and his soap box derby car maker, hanger on are destroying trust in the US as a trust worthy partner for data, business, or anything really. That is on top of a series of headwinds including, anti competitive practices finally getting fines, the slow realisation that subscriptions are not always better value, and the self owns from providers like Microsoft. Some of the more cautious organisations who's workloads that are not yet in the cloud, and some who are finding less utility and more cost in their cloud deployments may be considering keeping upgrades on their own systems in their own data centers (DCs) or moving back out of the cloud. This is not yet a large scale movement but if Microsoft keep hiking prices and going down and the US doesn't remove uncertainty over security and other partnerships some of those clouds might condense and the workloads may rain down on organisations own DCs and co location providers.

Anonymous Coward

There was another MS outage last night that broke incoming email into Office 365.

Of course they're testing it!

Anonymous Coward

They're testing it on you, and this seems to work perfectly.

Open FAIL

Anonymous Coward

I'm sure Micros~1 asked their buddies over at OpenAI about this, and ChatGPT said all would be fine!

"A lengthy outage occurred.."

Roger Greenwood

Is it just me? I read that as outrage...

disclosure:- I don't use outlook, just an interested observer.

This is why forced updates should be made unlawful

heyrick

Updating, or not, should always be a choice.

From apps that take existing features to make them "premium extras" or add even more intrusive advertising, to MICROS~1's continuing inability to properly test the shit that it releases (and a special shout out here to HP for their firmware updates)....all updates should be highly recommended, yes, scream that the sky may fall even, but always always let the user say "don't".

(and it would help greatly if all updates said what has actually been changed/done/fixed instead of some mindless twaddle about enhancing the user experience or, worse, "Some bugs fixed")

Re: This is why forced updates should be made unlawful

Mostly Irrelevant

Microsoft is forcing updates now? Why are you ranting about something that isn't happening?

Re: This is why forced updates should be made unlawful

Don Bannister

If I read the article correctly, this was an issue with Microsoft's own systems which affected webmail access.

A forced update on end users wasn't involved.

Groo The Wanderer - A Canuck

Gee, no problems with LMDE6.

And they think people are going to pay to upgrade to a Windows 11 box instead of jumping ship to Linux or BSD... *LOL*

Stop dreaming

Pascal Monett

If jumping ship to Linux or BSD was a business option, Borkzilla would already be dead.

Business is tied to Windows by the neck, the hands, the feet and the balls.

And Redmond knows it.

Re: Stop dreaming

Alex 72

Whilst I agree in the short term (and given most consultants tenure/ managers bonus timelines that seems to be all that counts) most businesses cant simply un-tether from Microsoft that it is not a small undertaking. It is however possible there are many businesses who's back-end is primarily Oracle Linux, Red Hat, IBM system i, or even open source. Some newer businesses allow their employees to use not only windows, mac or Linux to work on but also mobile os on phones or tablets. Established businesses or those that have built up a more recent dependency on client side software that is windows only as well as those who work in fields where the school college and university education of staff prepare them to do job x with y program on windows do have a cultural challenge as well on the client side but desktop, dhcp, DNS, Kerberos, LDAP, SQL, Email, word processing, accounting, analytics and whatever else Microsoft claim to deliver can be done by others. Microsoft dominates now but no one thought computers would replace typewrites, no one thought anyone would rival IBM, I am not saying it will be anytime soon or the user-base has given any indication it will be because of bad service, I am just saying they are not immune to change in the market and if something else comes along they might not be dominant forever.

Re: Stop dreaming

Mostly Irrelevant

How about Apple? I keep seeing people with Apple corporate laptops so it must be feasible for someone.

Re: Stop dreaming

CrazyOldCatMan

How about Apple? I keep seeing people with Apple corporate laptops so it must be feasible for someone

Speaking as someone who does Mac support (amongst other things) - they mostly use the MS Office stuff as local clients, not the webbified stuff (which is only used as a backup if their machine is down for some reason..)

Another day ending in y

ecofeco

Remember folks, a large portion of the world relies on M$ and their entertaining and wily ways of fantasy quality control.

I'm sure this will end well! ------------------------------------------>>>>>>>>>

Is Copilot writing the code....?

Oh Matron!

That is all.

Agile + crap testing

Anonymous Coward

Requirement

"Make X do Y"

Agile process to do the above

Testing - does X to Y..... yes. release

No do all existing tests complete correctly as they should

anthonyhegedus

This company just cannot write email software properly. Actually, they can't write any software properly. Windows/office has become so large and unwieldy that they themselves don't know how to make it work any more. And they don't need to do testing. People are used to shite service, so that's what they get.

The difference between Microsoft and Apple is that Microsoft keep steering their customers into corners, making them stop using X, start using Y etc. Apple just don't do it so blatantly and so much. There's no part of Apple's MacOS that tells you off for trying to use Chrome instead of Safari in the same way that Windows tells you off for using Chrome instead of Edge. That's just one example.

Their QA is the most appalling QA in the industry. They're bullies, and they're greedy bullies. A bit like HP.

The Register asked Microsoft how it validates its changes

JoeCool

I don't always test, but when I do test, I test in production.

Rhetorical question?

Someone Else

Reverting the change did the trick, and service was restored, but the question must be asked – does Microsoft test its changes before deploying to production?

Short answer: No.

Longer, more detailed answer: Of course not!

Next question?

Ugh.

LionelB

The web version of Outlook as an absolute car-crash at the best of times; and it gets worse with every single update . The composition editor is now so buggy as to be virtually unusable.

Re: Ugh.

Mostly Irrelevant

Yeah, all it needs to do is be 1000X worse and it'll be as bad as the classic version of Outlook.

I'm counting the days until it's no longer supported. that's exactly what the corporate IT departments need as an excuse to remove it from everything. Then we'll be free from having to make all the HTML emails IE 5 compatible (yes, seriously).

Webmail access ?

Don Bannister

Might this not also have affected users of the "New Outlook" desktop App ? Isn't it just a fancy interface to webmail, or do I have this wrong ?

At least IMAP/SMTP might give an alternative. If Microsoft's email client ever abandons them, it'd be webmail or nothing :-(

Anonymous Coward

"does Microsoft test its changes before deploying to production?"

Well no, given that its employees are beginning to be drawn from the same immature children behind DOGE.

Wolfclaw

QA costs money and on a balance sheet has no practical value, as Microsoft and many others have switched to let the users do the testing, not like they will get any financial penalties?

The most difficult thing in the world is to know how to do a thing and to
watch someone else doing it wrong, without commenting.
-- T. H. White