Our office has just switched from Outlook 2008/Exchange to Outlook2013/IMAP. Color categories have to some degree disappeared. Unfortunately, our DIrector made extensive use of these categories and is not a happy man at the moment.
I've read in some places that categories are not supported for IMAP files, but other places show macros for enabling them. The macros I've come across are not very readable and I'd basically have to try them and see what happens ... which makes me nervous with respect to the Director's email!
The category color information must still be retained in the IMAP message because if you navigate to a message previously categorized in Outlook2007/Exchange they show:
If the information is still there and viewable, then clearly IMAP retains the attribute. There must be a way to set categories on new message, view by category, etc. I'm open to using macros and am familiar with VB, but need to feel good about what the macro is doing.