In my outlook setup I have my co-worker's calendar open along with my own so that I can schedule for all of us at the same time. So, I have 5 calendars open in the "My Calendars" section. I choose to overlay the calendars in my view so that I can easily see where there are available times for scheduling.

Here's my problem. Every time I switch from my mail, contacts, or another area of Outlook into the Calendar, my partner's schedule is the active one. I frequently don't realize this and end up scheduling on his calendar instead of my own.

I made them different colors to try and cue myself, but I don't always notice. I also tried changing the order of the folders, but that doesn't seem to affect anything.

Any ideas on how I can make it always default to "My" calendar being the active one every time?