Exchange 2010, Outlook 2010 & BTInternet account - Calendars

Ok,

I have Outlook 2010 installed on my computer and use this primarily for my exchange account, joe.bloggs@xyz.com - This is working fine without issue. I have another account, my joe.bloggs@btinternet.com account which i use for other business and want to keep completely seperate.

The issue i am having is whenever a user sends me a meeting request to my @btinternet.com account and i accept, the meeting is posted to my @xyz.com Exchange calendar and the reply sent to the person requesting the meeting is from my xyz.com account.

I need the ability to share my @xyz.com calendar with my staff but keep any appointments sent to my btinternet account private and on a seperate calendar. I need to have all of my accounts (i have a few different pop accounts) under one outlook profile so i can manage them without having to close and change the outlook profile.

I am using Exchange 2010 running on SBS 2011, all of the people viewing my calendar are also using Microsoft Office 2010

Any ideas?