The business workflow tools accelerator custom workflows from the on premise environment will not work in the online environment. Custom workflow rules are not supported in CRM Online. They will need be re-created as plugs-ins to function. It has to do with
the .net 4 framework.
See this msdn article that states that custom workflow assembles are only possible in on-premise.
"Microsoft Dynamics CRM workflows are not supported to run in sandbox mode. To prevent execution of any arbitrary or malicious code in custom workflow activities and custom XAML workflows that could compromise data security, custom workflow activities
and custom XAML workflows are not supported for Microsoft Dynamics CRM Online."
http://msdn.microsoft.com/en-us/library/gg328264.aspx
Jerry
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