Office 365 - Exchange Online

Last Updated: 04/05/2018


Exchange Online is Microsoft's cloud-based email and calendaring application included with the Office 365 suite, made available for faculty, staff, and student employees.


  • Email and shared calendaring with 50GB of storage space.
  • Message size up to 50MB
  • Improved Outlook Web App (same functionality across all modern browsers) and tight integration with Office 365 suite.
  • Global address list including name, department and phone information for all faculty and staff.
  • Email contact data for all people, resources and lists in Exchange Online environment.
  • Accommodates multiple personal calendars, group calendars, as well as resource calendars for scheduling of rooms, equipment, and other resources.
  • Built-in virus scanner.
  • Custom configuration abilitiies.

Outlook Web App

The Exchange Online service offers a web based email and calendaring client through the university's Office 365 subscription called the Outlook Web App. If you have previous experience using Outlook, the new version will be familiar. For users newer to Outlook, we recommend visiting Microsoft's Getting Started guide for basic instructions.

Visit the Outlook Web App page for the full list of Email and Calendaring tutorials compiled by OIT for campus users.

Best Practices 

OIT has put together Best Practices for those that use the delegation feature to manage their calendar in Exchange Online. Visit the Exchange Online Calendaring Best Practices page for more.

Mail Client Configuration

General configuration settings:

*Note: If using software that does not support Exchange (e.g. Thunderbird) and connects using IMAP, you will need to enter as the outgoing server address and 587 as the IMAP port number.

For users setting up an Exchange Online account with a mail client, refer to the following tutorials:

Recommended Email Clients:

Other Email Clients:

Delivery Location

Faculty and Staff are encouraged to use campus email delivery in order to comply with CU's Record Retention Policy. If you are concerned that this will interfere with your academic or research pursuits, you may request an exemption to utilize a different delivery location.