Hi PointDeveloper,
When you deploy a Visual Studio 2010 workflow on a local server running Microsoft SharePoint Foundation 2010 or Microsoft SharePoint Server 2010, you are going to have additional features that are not available with SharePoint Online for Office 365. For key restrictions in SharePoint Online, review the following articles:
SharePoint Online: software boundaries and limits
SharePoint Server 2010 capacity management: Software boundaries and limits
The following SharePoint Online Community forum post contains valuable information concerning SharePoint Online and Visual Studio 2010.
Thanks,
Allen Qiu