What Is Microsoft Exchange?
Exchange is Microsoft’s groupware server, originally developed for corporate customers.
So, as a server program, how does this impact you?

It used Microsoft’s ownActiveSync technology, and more recently the open Messaging utility Programming Interface (MAPI).
To find a link to your OWA site, if it exists, selectFiles>Account Settingsin Outlook.
Many people used OWA for mobile access to Exchange data before Outlook applications were readily available.

But Exchange is also the technology that powers cloud-based services that you, as a consumer, can access.