We are having a problem with Outlook 2010 when sharing calendars. The user that sends out the calendar to share has created colour categories and has the events/appointments on the calendar organised into different colours depending on the category. However, these colours are only appearing on the shared calendar for some users and not others. I have checked the calendar permissions and they all match. I have tried one suggestion to re-create the colour categories on recipient users profile but this did not bring the colours through.

Any ideas?