Microsoft Exchange Online in Office 365 is the latest release of this world-leading messaging and
collaboration platform, providing one location for composing, reading, and storing email, calendar,
contact, and task information in Microsoft Outlook. Exchange Online includes a massive 50 GB mailbox (up from 25 GB) combined with unlimited storage within the archive mailbox in the Office 365 E3 or E4 plans or Exchange Online Plan 2. Exchange Online supports access from most mobile devices, including BlackBerry, iPhone, Nokia, and Windows Phone.