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In the previous two chapters, we've covered the full installation and configuration of a basic but highly available Exchange Server 2010 infrastructure. However, it doesn't have to be that way. If you're prepared to sacrifice some of the control, such as determining when and how the underlying Exchange infrastructure is maintained and upgraded, then there's another option, Office 365.
Microsoft's cloud-based online-services offering provides Exchange Server 2010 along with Lync Online and SharePoint Online 2010, and is paid for through a monthly subscription. In this chapter, we're going to cover the following: