Is it possible to create an Office 2003 VSTO add-in from Visual Studio 2010?

No, unfortunately it's not possible. VSTO 2010 will not compile solutions designed for Office 2003. It is designed to work with with 2007/2010.

No, unfortunately it's not possible. VSTO 2010 will not compile solutions designed for Office 2003. It is designed to work with with 2007/2010.To create solutions for Office 2003 you'll need VSTO 2005 on VS2003 or VSTO 2005 SE / VSTO 2008 on VS2008 (in the case of the later, you can also develop for Office 2007).

I find that hard to believe. What documenation or reference can you provide to back this claim? – AMissico Jun 22 '10 at 4:34 Sorry to be the bearer of bad news here.

Msdn.microsoft. Com/en-us/library/bb772080. Aspx – Otaku Jun 22 '10 at 5:26 1 @Otaku: Yes, I understand that VSTO 2010 will not install if Office 2007/2010 is not installed, but saying it won't install if Office 2003 is installed is not correct.

Therefore, your answer is not correct. – AMissico Jun 22 '10 at 7:47 1 @Otaku: "If you need to develop for Office 2003 and 2007, VS2008 is your platform." You are absolutely correct and this is the correct answer.

I think you should change your answer then I will up vote and Ben Robbins will get his answer. – AMissico Jun 22 '10 at 7:49 1 @Otaku: Yes, Office 2007 can run side-by-side with Office 2003. I have this configuration now on my laptop.

I have done it on four other computers. I have created add-ins with VS2k5 (for Excel and Word) and VS2k8 for (Outlook and OneNote). I do not have an opportunities for Office 2010 development, so do not have the software installed.

– AMissico Jun 22 '10 at 7:58.

No. The Office version is tied to the VSTO version which is tied to the Visual Studio version. Since VSTO 2010 does not support Office 2003, you cannot migrate.

Also, you need to be aware that opening a file extension may open the incorrect Office version. For example, on startup the later versions of Office will register themselves into the registry. If you are developing an Excel 2003 VSTO project, but you manually open an Excel 2007 workbook, then 2007 becomes the default.

The next time you work on the Excel 2003 VSTO project, it will use Excel 2007. To get back to Excel 2003, you must run excel /regserver. Description of the startup switches for Excel at http://support.microsoft.com/kb/291288.

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