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I have created an Outlook addin using VS2010 and VSTO 4.0.
On Windows7+Outlook 2010, the installation and and application behaves as expected.
On Vista+Outlook 2007 (fresh installed virtual machine), the installer complains that it does not recognize the .vsto file format.
Has anyone experienced this? When I previously created VSTO3.0 addins and used them on Outlook 2007 I had no problems with installation.
You need to install the VSTO 4.0 runtime (which comes pre-installed with 2010, but not with 2007). You can download it from Microsoft right here.
If you deploy using ClickOnce this runtime gets added to the prerequisites automatically.