You will need the 64-bit version of Windows Server 2003 or Windows Server 2003 R2 to deploy Exchange 2007. Volume licensing customers can exchange their 32-bit version of Windows Server 2003 for the 64-bit version any time by using their media kits.
When you upgrade to Exchange Server 2007, you cannot perform an in-place server upgrade on an existing Exchange server. Instead, you must install a new Exchange 2007 server into the existing organization, and then move the required data to the new Exchange server. Exchange Server 2007 supports mixed environments that include Exchange 2000 Server, Exchange Server 2003, or both. This allows for an easier and more gradual transition. For more information about how to plan and deploy Exchange Server 2007
Yes. Exchange 2007 is based on Active Directory sites. If your current Microsoft Exchange environment maps as closely as possible to Active Directory sites, your interoperability and migration story will be easier. Additionally, the recommended upgrade path is to upgrade all the Exchange 2000 Server or Exchange Server 2003 servers in a single routing group before you upgrade the next routing group. This lets you fully decommission a routing group as you upgrade and reduces the complexity of your current routing topology. Mapping the Exchange 2000 Server or Exchange Server 2003 routing groups to the Exchange 2007 physical topology also makes it easier to plan for an upgrade to Exchange 2007 because the two environments are similarly organized and generally correlate to Active Directory sites.
You can deploy Exchange Server 2007 directly into your organizationís existing Active Directory topology. For many organizations, deploying directly into the existing Active Directory topology greatly simplifies the overall management of the Exchange 2007 deployment. However, given the extensive access to domain controllers and global catalog servers that is required by Exchange 2007, you may decide to create dedicated sites for your organization. You might want a dedicated site if other applications in your organization must access Active Directory domain controllers and the global catalog server.
Link state routing must be disabled whenever two or more routing groups are configured to send or receive mail from an Exchange 2007 computer that has the Hub Transport server role installed. (The Hub Transport server was formerly known as a bridgehead server). This is because Exchange 2007 uses Active Directory to determine routing topology. The Exchange 2007 servers do not propagate link state updates. If link state routing is enabled and there is more than one routing group configured to send mail to or from an Exchange 2007 Hub Transport server, routing loops might occur.
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