Amazon Web Services (AWS), the biggest public cloud currently available, today announced the general availability of the WorkMail email and calendar service, nearly a year after the service was first launched in preview.

Think of WorkMail as Amazon’s answer to Microsoft’s Exchange, which fields the competing Azure cloud infrastructure, and Google’s Gmail, which has the Google Cloud Platform.

Since it was introduced last year, Amazon has been working on several enhancements, including support for Apple Mail and Microsoft Outlook email clients, as well as a migration tool to make it easier for people to move off of Exchange, according to a blog post by AWS chief evangelist Jeff Barr.

Unlike the commoditized compute and storage resources that companies can provision to run their applications, WorkMail is a service that abstracts away those underlying resources. It’s basically software as a service (SaaS) running atop the market-leading infrastructure as a service (IaaS). Amazon has been launching more and more of these types of services, including the Lambda event-driven computing service, the WorkDocs (formerly Zocalo) file sharing service, and the QuickSight business intelligence service.

The service costs $4 per user per month, with 50GB of storage allocated to each user. It’s working out of AWS’ US East (Northern Virginia), US West (Oregon), and Europe (Ireland) regions, Barr wrote.

In the future, he added, Amazon will offer support for integrations with existing email archiving systems.

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