How To Allow Comma As Addresses Separator In Outlook Composing Emails?

To have Outlook see commas as separating multiple email recipients:

1. Select File > Option in Outlook.
2. Open the Mail category and go to the Send messages section
3. Put a check next to Commas can be used to separate multiple message recipients.
4. Click OK.

*This would mainly apply for personally owned machines.  This setting is automatic for Valencia owned devices.