Exchange Outlook Calendar categories Color

I had the same issue& here's the work-around:

Now , i don't use exchange, so I am not sure if this is possible for you, but what I was go to the left hand side of Outlook, where you see "My Calendars".

1. create new a new calendar for similar things (ex: Birthdays & Anniversaries). Follow this step so that you have a few different calendars, all corresponding to your colored categories.

2. Go up to "View" & change the view to "category". Now drag & drop the categories that the color coded categories correspond to the NEW calendars.

3. the new calendars may not correspond color wise, but at least they will be differentiated enough for you to decipher on your iPhone calendar.

check out this link for help using multiple calendars in Outlook: http://office.microsoft.com/training/training.aspx?AssetID=RC102063801033&pid=CR 100654581033

Anybody knows why?

Because the iPhone doesn't support the syncing of categories.

Interesting work around, but is there a way in Outlook to combine all your calendars like you do on the iPhone

yes theres a way to combine all these new calendars, though it dosent look as good as when you started.

again on the left where you created the calendars you want to tick the box next to each of the calendars you want to view, then at the top of each individual calendar (other than the far left calendar) there is a a tab with an arrow pointing left. click on this and it will combine with the calendar to the left of it. click on all of these arrows and hey presto all the calendars are combined.

the tabs will still be at the top, if you select these, that calendar will become bold. all the others will look faded out. I don not know of a way of selecting more than one or all of them.