Upgrade exchange 2007 to exchange 2013 on SBS 2008

10-11  Source: Network gathering  Views:2 

I need to upgrade EX07 to EX13 on small business server 2008, So I am looking for the documents or steps which will help in Implementation.
Thanks in advance!
Any update about the issue?
In-place upgrade is not possible. According to the MS article:
When you're upgrading your existing Exchange 2007 organization to Exchange 2013, there's a period of time when Exchange 2007 and Exchange 2013 servers will coexist within your organization. You can maintain this mode for an indefinite period of time, or
you can immediately complete the upgrade to Exchange 2013 by moving all resources from Exchange 2007 to Exchange 2013, and then decommissioning the Exchange 2007 servers. You have a coexistence scenario if the following conditions are true:
Exchange 2013 is deployed in an existing Exchange organization.
More than one version of Microsoft Exchange provides messaging services to the organization
Upgrade from Exchange 2007 to Exchange 2013
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