Mark the replies as an answers if they help and unmark them if they provide no help. The changes that you make should be saved in the MCL and should be viewable from other clients and devices. Make any additional changes that you want by changing the names of categories and by adding or removing categories, as appropriate.For each category for which you want to change the color, click the color block, and then select the color that you want.If you have more than one account that's added to Outlook 2016 for Mac, make sure that the correct Exchange account is selected.On the Home ribbon, click Categorize, and then click.The App's interface PRIORITY SHOULD BE to highlight and prioritize visibility of WHO an email is from NOT if it has been read or unread which could still be done with the simple side bar or bolding. Particularly with the volume of email we all get these days. We can update the colors that are assigned to categories in the MCL in Outlook 2016 for Mac. The Mac Outlook 2016 method of using one color (blue) solely to highlight Read vs Unread is an interface and usability FAIL. What's your account, Exchange, IMAP or POP? What do you mean about 'there are categories that were not in the list of the Categories (Organize>Category)'? Please confirm if this email account is added in other computers and add more categories.
