Running Word from a SharePoint Workflow

Hi All, based on http://stackoverflow.com/questions/630449/join-ms-word-documents I have made a console application that splices multiple word files into one. Now I want to do the same from a Workflow in SharePoint. In short, my code before it fails looks like this:

object oMissing = System.Reflection.Missing.Value;
Microsoft.Office.Interop.Word.ApplicationClass oWord = new Microsoft.Office.Interop.Word.ApplicationClass();
Microsoft.Office.Interop.Word._Document oDoc = null;
oWord.Visible = false;
Microsoft.Office.Interop.Word.Documents oDocs = oWord.Documents;
object oFile = tmpFileName;
oDoc = oDocs.Add(ref oMissing, ref oMissing, ref oMissing, ref oMissing);
oDoc.Activate();

When I reach oDoc.Activate(), I'm thrown the following exception, even though I only have one instance of the workflow running and no other instances of Word is running on the server:

The message filter indicated that the application is busy. (Exception from HRESULT: 0x8001010A (RPC_E_SERVERCALL_RETRYLATER))

Why do I get this error?? What would make the application busy?

Cheers

Nik

From stackoverflow

• The Office applications are not built to run in a server environment - they are purely desktop applications. Don't call them from a server.

• If they are Word 2007 Documents, I think that you should look into the Word File Formats and see if the Article from Microsoft helps:

  http://msdn.microsoft.com/en-us/library/bb656295.aspx

  Office Interop is always a bit unstable, and running it on a server is the last thing I would recommend unless there is really no other way to do it.

  In a Sharepoint Environment, maybe the Document Converters can somehow help, although I have no experience with them - just as a hint at something to look at.

  niklassaers-vc : Unfortunately they aren't all Office 2007 documents, most of them are 2003. Thanks for the Document Converter link, I'll be sure to read it through.

  niklassaers-vc : Would Migration Planning Manager (http://tinyurl.com/tdt6r) be a good way to convert the documents to Word 2007 and then go the Office Open XML SDK route?

  Michael Stum : I have no experience with Migration of existing documents to 2007 since I always only needed to open and re-save them in Office 2007, but if your users are not Office 2007 yet that that would not be an option anyway. I don't know if you can batch-convert documents to 2007 with any tool :/