Consultant With 2 Exchange Accounts: Synchronize Calendars?

Folks,
I am a consultant with what seems to be a common problem. My company uses Exchange 2003, which I interact with via Outlook 2007. My client uses Exchange 2003, which I have to interact with via OWA. All consultant email accounts are set up such that any emails coming to the client email will be forwarded to the consultant’s primary email account then removed from the client exchange server. Well, this is an issue with calendars – I can’t keep my 2 calendars synchronized. What I was wondering is what my options are for this? Thanks in advance, everyone!

WanToolsMan