Exchange 2013 continues to be a disappointment. Why is it that this public folder issue (which probably affects only a small percentage of users) results in a new CU2 build, whereas this calendar forwarding issue (which affects everyone and was already broken in CU1) will not be addressed until CU3? Moreover, you are strongly recommending even those who don't use public folders to upgrade our servers to this new build even when it offers no benefits whatsoever, only a waste of time, risk of something going wrong and again having to correct all the settings that go wrong in the upgrade.
Also, can you finally fix that damn Discovery Search Mailbox issue that has been plaguing us since 2010 (the one where you have to delete this mailbox before the upgrade or you will get an error).