Now here's something everyone must read :)
Comparing Exchange Online and Exchange Server 2013 - Exchange Team Blog - Site Home - TechNet Blogshttp://blogs.technet.com/b/exchange/archive/2012/09/19/comparing-exchange-online-and-exchange-server-2013.aspx
"Now that Office 365 has over a year under its belt and the new Exchange is around the corner, you may be considering upgrading your on-premises email system, moving to the cloud or a combination of the two with a hybrid deployment. We’ve invested heavily in providing you with an awesome email experience and the flexibility of choosing how you’d like to deploy it.
There are a lot of important factors to consider but these factors have changed with the introduction of the new Exchange. Here’s a summary of some key factors to consider between staying on-premises and moving to the cloud, as well as some feature areas where we’ve made enhancements to make it easier for you to go to the cloud while maintaining control."
Read the full post at the source : http://aka.ms/lph4ic
Have a great weekend,