Before you install MS Exchange 2007 or 2010 make sure, that IPV6 protocol is either fully enabled in all interfaces or fully disabled. Failed to do so will render your server to be almost inaccessible just after MS Exchange installation (the network provider services will not start or at least will start after very, very long delay). This is probably caused due to a bug (or mistake in design) in MS Exchange networking services.
To make the bad thing worse, the MS Exchange 2010 installer do not install all the required Windows Server 2008 roles and features making the installation of MS Exchange even more complicated. Follow the following article to install all the necessary roles for your server to work properly: http://technet.microsoft.com/en-us/library/bb691354.aspx
Moreover, if you see “Topology” errors in Event Log after the Exchange server installation you have to add “Audit security log” right for user “Enterprise Exchange Servers” in a domain-wide Group Policy Object.
Anyone can tell me why Microsoft is doing this? Can’t the installer do everything which is needed for the product to work? Akhh…