MailBee.NET EWS is a lightweight .NET component which lets applications send, receive and otherwise process e-mail messages, contacts, appointments, work with folders, attachments, shared mailboxes on MS Exchange and Office 365 servers via Exchange Web Services. The EWS component is a wrapper for EWS Managed API which lets you send, receive and manage mail, contacts and other kinds of Exchange items via web services. EWS is more flexible than IMAP/SMTP and is often the only service enabled in Exchange meaning you may have no other choice but to use it instead of IMAP or SMTP. You can use EWS with both on-premises Exchange and Office 365.