In Outlook 2010 on Windows 7, I was able to alter the “New Mail Desktop Alert” duration to up to 30 seconds in Outlook or perpetual via your mentioned Registry key modification.

Now that I’m using Outlook 2013 on Windows 8, the new mail alerts are only visible for 5 seconds and I can’t find an option to change that in Outlook 2013 nor does the Registry hack do anything.

Is there a way to get these mail alerts to show for longer than 5 seconds for Outlook 2013 on Windows 8?