Be aware this upgrade will remove the "reset password" role from the organization management RBAC group and will also remove it from any other RBAC groups you may have given it to. It will also take away the -delegating permission from the organization management group, so you'll have to start over and scour the internet for the necessary commands to restore the ability to reset passwords through the EAC, both for yourself, and for anyone you've delegated this to.
Exchange Team: please consider making it less difficult in the future, to utilize the excellent reset password feature you built into the EAC, both for administrators and for the help-desk people we might delegate this ability to. If the security types won't allow this, at least consider rewriting the related technet articles to clearly explain the procedure, not only the commands which must be typed, but the fact that they must be typed from an exchange server and won't work if typed on a workstation with management tools installed. Personally, I found this frustrating. Just my two cents worth.