Exchange Server OS (operating system) preparation
* HotFix required to install exchange server 2010 (the following five patches are required for previous versions of windows server 2008 R2 sp1, but not for later versions of windows server 2008 R2 sp1)
1.KB979099
2.KB982867
3.KB979744
4.KB983440
5.KB977020
* Exchange Server 2010 Hub and MBX require Filter Pack filter package component to implement mail filtering.
* CAS server requires the "Net.Port Sharing" service to start automatically.
* install the active Directory management tool RSAT-ADDS to prepare AD.
* add IIS module components
