I need to know if anyone is dealing with any exchange issues, be user size or anything else.  I getting all kinds of answers from EMC and I am not sure what the real answer is.  Some at EMC state the above 500 users is getting to large and should advoid using avamar.  I have a customer with 1200 users and need some direction.  The install will be version 5.0 ds4 to start.