![]() ![]() In other words, a version of Exchange Server can be migrated to from the previous two versions, but not from any older versions. For example, Exchange Server 2013 can be migrated to from Exchange Server 20, but not from Exchange Server 2003. The upgrade scenarios for Exchange Server are typically N-2. ![]() The reasons for this are that the server architecture and internal workings of Microsoft Exchange Server often change so much between major releases that upgrades would become perilous exercises that are nearly impossible to adequately test for. Instead, an Exchange Server upgrade from one version to another involves a migration of services and data from old servers to new servers. The first thing to be aware of when planning your Exchange Server migration is that in-place upgrades of Exchange Server are not possible. For example, you cannot upgrade an Exchange Server 2007 server to Exchange Server 2010, or an Exchange Server 2010 server to Exchange Server 2013. However in most cases a migration is able to follow a standard process, with only those special or unique characteristics of the Exchange Server environment likely to cause problems or require additional planning and effort. ![]() Upgrades and migrations for Microsoft Exchange Server can seem like a complex and difficult process. ![]()
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