Windows – How to set Outlook 2010 as the default mail client

From what I've read - I haven't tried it - you can have various Office versions installed side by side, but not Outlook. It's curious, but there must be something about Outlook where you cannot have multiple versions installed. If you need Outlook 2007, you should modify your Office 2010 installation to remove that Outlook, then install Outlook 2k7.

I've had this same problem recently and have also looked online for solutions, without much success. Here are a few ones worth considering:

• Run repair on your Office 2007 (instructions can be found here)
• Verify that Outlook is really your default mail client. To do this, go to Control Panel > Network and Internet > Internet Options > Manage browser add-ons > Programs> Internet Programs.
• If all else fails, try closing Outlook when sending your forms in InfoPath.