The Office 365 system caps individual email recipients at 500, regardless of user. This is an Office 365 limitation and not a UCCS limitation.
However, with the new Office 365 email system, you can create your own lists - termed 'distribution groups' in Office365, which allows you to add more than 500 recipients to an email.
Step 1: Log into the Outlook Web App (OWA)
Log into the Outlook Web App (OWA) by going to https://outlook.com/uccs.edu
Step 2: Click Settings Icon
Once you login, click the 'Settings' gear icon in the upper-right corner of the page.
Step 3: Select Mail
In the 'Settings' menu click the 'Mail' option towards to the bottom of the list.
Step 4: Select General
Once the Mail settings page loads, click the General menu option to expand the options.
Step 5: Select Distribution Groups
Click the Distribution Groups option under the General options.
Step 6: Create Distribution Group
Under 'Distribution groups I own' click the '+' button to make a new group.
Step 7: Add Users
The following window will allow you to name the group, add owners, and add members.
Any item with an asterisk * by it is required to be filled out before you can save the Distribution Group.
Groups I Belong To vs Groups I Own
If you are a member of a distribution group it will appear under Distribution groups I belong to.
If you are an owner of the group the list will appear under Distribution groups I own.
It is possible to be both the owner and member of a Distribution group.