Technology vendor rivals Oracle and Microsoft are uniting against cloud computing challengers that are making enterprise inroads. The two companies unveiled a joint service that makes Oracle's hardware and software available through Microsoft's Azure cloud. Database services previously exclusive to Oracle Cloud Infrastructure are available for consumption through Azure instances, with Oracle Exadata server hardware now co-located within Microsoft-owned data centers in the new Oracle Database@Azure offering. Larry Ellison, founder and CTO of Oracle, said having Oracle available within Azure supports the multi-cloud buying habits of customers. As such, buyers hold back from competing for cloud adoption due to performance limitations, pricy vendor lock-in, and the challenge of re-creating existing workflows on cloud tools. Specific services to be available in Azure include Oracle Exadata Database Services, Oracle Autonomous Database, and Oracle Real Application Clusters.