Microsoft has acknowledged that Office 365 is experiencing a European outage, the second time in three months that the system has been unavailable for a sustained period.
Many users are unable to log-in to Office 365 through the front-end portal, resulting in perpetual lag, while the website promises that technicians are "working on it". Those who are able to log-in to services, for example Outlook, experience further lag inside the service environment when trying to open emails.
@Office365 My email, phone access and webmail has been down since 8.34am - is there an update on server fix?— Michelle Allison (@m_allison) February 22, 2016
Office 365 seems to have been inaccessible by those affected since around 9am this morning.
Users on Twitter report "multiple customers experiencing outages, and accuse Microsoft of "fix[ing] one thing and breaking another".
Microsoft later issued a statement acknowledging there was a problem but claiming it only affected a small number of customers.
"A limited number of customers in Europe may have intermittent access to email on mobile devices, and we're working on a fix," said the statement.
"Customers can access email via Outlook client or Outlook on the web and can visit the O365 Service Health Dashboard for updates."
Office 365's last major outage was on 3 December and included Azure services. It lasted around four hours, and cloud email management firm Mimecast warned at the time that continued outages could begin to have "a detrimental impact on the country".
A further outage took place on 18 December and was attributed more directly to Microsoft's Azure functions.
The outages underline the problems that can occur with cloud-based services, which are becoming increasingly popular with organisations looking to remove the hassle of on-site systems management.
V3 will host a Cloud & Infrastructure Live online event on 20-21 April. Register now to hear more about issues concerning data centres and the cloud.
EE, O2, Vodafone, Three and Airspan open the bidding
Worried about data privacy? Here are several ways to secure your Facebook account
The ICO is seeking an urgent warrant to investigate a major data breach - everything you need to know as the story continues to unfold