Default multiple exchange accounts into 1

does any one know how i could get calendar and email events from me@company1.com and me@company2.com into a single exchange server for using active sync?
I have access to Outlook and a PC at one employer that uses Exchange.
I have access to Outlook and a PC at another employer that uses Exchange.
I personally host my own Exchange server that i sync my phone with.
How can i get company1 and company2 to automatically send calendar and email to the my server?
I only have admin rights to to the exchange server at company2....
any 3rd party software, anyone else doing this....
thanks for any ideas.