Kayako Fusion May 2026

Before Zendesk became the default, before Intercom introduced the messenger-first approach, and before "AI agents" were a thing, there was Kayako Fusion. It was the desktop client on steroids, the workhorse for thousands of support teams from 2010 to 2015.

Today, the remaining Fusion installs are running on forgotten VPS servers, held together by duct tape and PHP 5.6. Most teams have migrated to Zendesk, Help Scout, or Intercom. kayako fusion

If you have been in the customer support or SaaS space for more than ten years, two words still carry a certain weight: . Before Zendesk became the default