OSX Mail App uses lots of memory with Exchange change

A couple weeks back, we switched from exchange 2007 to exchange 2010.   The only change required on the OSX mail client was to change the server address.   I have two macbook pros, one is a 2GB early vintage intel, and the other a more recent 4GB model.   Both of them are configured for access to the exchange server.   Both are running 10.6.  
Once the change was made, both clients started using huge amounts of memory.   This isn't a leak, as is reported in some Lion threads, because it eventually comes back down again.   When you start the client, it might use about 150MB of RAM.   After a while I have seen as much as 1.6GB of RAM usage on the 4GB machine.   If you take the exchange account out of the mix (disable it in preferences) the client consistently stays at about 75MB of RAM.  The peak isn't limited by the client as far as I can tell -- it basically uses up all free memory and drives the system completly nuts.   Many of the applications no longer perform well once they are subjected to memory starvation, and this includes the mail client itself.  
I am now running the activity window with Mail to see if I can spot a pattern, but in one case I watched Mail's memory usage grow in Activity Monitor with nothing in the Activity screen.  
I aso tried creating a new account instance on the 4GB machine, but without any cached data the behavior was far worse.  It very quickly consumes the entire machine and doesn't seem to return to normal. 
I am firmly convinced this is a side effect of changing the exchange service or one of the exchange settings, if for no other reason than the behavior is new on two systems.   It's still unforgivable for the Mail client to do this -- if it can consume all available memory then it needs to monitor itself and defer or break up what it is trying to do.   I am a great fan of this mail client but this is so unusable that it might force me back to outlook running in a VM.
Any suggestions?

I did not get a solution from the community, but I can provide one.   However, mine was not a leak.   It would use over 2GB of RAM at times, but eventually return to 150MB or so for a while, then back up again.   I shouldn't have taken it to the genius bar, rather I should have just filed a bug.   I have not done that yet because I have resolved it.   I eventually just bit the bullet and deleted absolutely everything associated with the account.  Every cache, every plist, everything I could find.   I did not capture the specifics unfortunately, because at the time I wasn't even convinced it would work, but I had no other option.   Starting with a totally new account after that, it went through a period of about 24 hours where it would still use a lot of RAM, but then settled in.   It's been well behaved now for a number of weeks. 
I would be curious if your RAM usage ever decreases, and if you try the same solution if it works for you.  
Good luck. 
-Jeff

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