It’s not been a great week for cloud computing service provider Rackspace.

On December 2, customers began experiencing problems connecting and logging into their Exchange environments. Rackspace started investigating and discovered an issue that affected its Hosted Exchange environments.

Now Rackspace has announced it was actually a ransomware incident that caused the service disruptions.

While the investigation is ongoing, there are no details known about which ransomware is at play or how the threat actor gained initial access. In a press release Rackspace said that the incident was isolated to its Hosted Exchange business.