Outlook 2010 gives you the option of using commas as address separators for emailing purposes if you need to do so. Here's how:

From your Inbox in Outlook 2010, go to "File", and then "Options".
file-menu.jpg

Once in Options, select "Mail" from the left-hand column. This will change the options shown in the right hand view of the window. Scroll down the settings until you reach the heading "Send messages". Under that heading, click the check box next to "Commas can be used to separate multiple message recipients", and then click "OK".
options.jpg

This should allow you to use commas as address separators when you send email.


Additional Resources

Here are some articles that may give you some additional information on using commas in email addresses at CU:
Emailing Students from MyCU


Support

If you have any questions or concerns, please contact the Technology Service Center via email at support@cu-portland.edu.


Reviewed by Chad Smith 8/6/13