While its initial investigation determined the fault was primarily in India, additional data found it was affecting users globally.
“We’ve collected additional data from the affected infrastructures to determine impact to our Exchange online protocols. Additionally, we’ve identified this issue to be affecting users worldwide", the company followed-up.
“Users may experience problems with various Exchange Online protocols including Outlook desktop, mobile devices as well as those dependent on REST functionality.”
According to the website DownDetector, Office 365 and Microsoft Teams was also affected.
Of those making reports about Office 365, 60 per cent were affected by the Outlook issue and over a quarter were struggling to connect to servers.
For those having trouble with Microsoft Teams, nearly half were experiencing issues connecting to the server or logging in.
This was the second of such outages in a week for the software giant.
Yesterday, the company said both SharePoint and OneDrive were not working properly.
The outage took took place mere hours after an issue had also affected the company’s Teams, Outlook and Office products.
It is unclear if these issues are related.
"Our engineers have mitigated the issue for Microsoft SharePoint and Microsoft Teams users. The majority of users of our Exchange services are also seeing service recovery as we work towards full resolution", a Microsoft spokesperson said.