By purchasing this electronic license, you will receive an annual subscription to the official version of Microsoft Exchange Online Plan 1.It is state-of-the-art e-mail software that will help the user increase productivity and security . Microsoft Exchange Online supports the latest version of Outlook, which mainly offers an increase in mailbox capacity to 50 GB. Other added functions are e. g. a calendar with the ability to schedule appointments and share events, or an improved address book with contacts.