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In order to develop SharePoint 2007 workflows in Visual Studio 2008 on 64 bit, I would create a new (non-SharePoint) Workflow project. Then, I would add the appropriate onWorkflowActivated activities, etc.

I have migrated some workflow projects from VS2008 to VS2010 and they seemingly worked fine. I say seemingly because they were able to compile correctly, run correctly, and I was able to modify all the existing activities without problems.

Now, I am starting a new workflow project and I performed my normal routine, but the SharePoint activites were not on the Toolbox. I enabled all items to be shown and the SharePoint Items were greyed out (Assembly version, not the tab for 14). I unloaded the project and compared it to a project created with 2008, and I was missing the SharePoint workflow project template guid. So, I added it and could no longer load the project.

Besides working on 32 bit or developing in 2008, does anyone know any other work arounds?

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Have you found any information regarding this issue? Do you have some sample VS2010 workflow projects targeted for MOSS 64bit? I have the same issues – Anonymous Sep 29 '10 at 0:45
Unfortunately, no. I am doing WF dev in 2008. – MBSurf Oct 1 '10 at 12:51
up vote 2 down vote accepted

See this article ->, it will solve your problem.

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I believe you can only do 32bit development for SharePoint 2007 in Visual Studio 2010, see this post from last year:

There could be many reasons for this, but I believe MS want people to fully move to 64 bit-only, SP2010 environments asap.

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Well, in the article is says "Experience for developing for previous release of SharePoint ... with Visual Studio 2010 has not changed compared to Visual Studio 2008. " Unfortunately, it has. In 2008, while SharePoint 2007 workflow projects in a 64bit environment weren't supported, I could still create a standard Workflow project with all the SharePoint toolbox items visible. In 2010, I can create a standard WWF 3 project, but the SharePoint 2007 toolbox items do not show in the toolbox. – MBSurf Oct 1 '10 at 12:51

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