Some users want to disable new mail desktop alert in Outlook 2007. This maybe necessary if you don’t want users/customers to see your emails as they trickle in, while you are in a meeting or presentation.
To do so, While in Outlook Click on
1. Tools, options, Preferences tab
2. Click on email options, under message handling section, click Advanced e-mail options
3. Under When new items arrive in my inbox section, uncheck display a new mail desktop alert box
4. Click ok, ok, ok and you ‘re done