Outlook Error - Either there is no default mail client or the current mail client cannot fulfill the messaging request

Outlook Calender Invitation issue

This problem occurs in every MS Outlook software and issue is related to registry key that got corrupted. Below is the simple solution to overcome this issue.

DELETE the Outlook subkey and REPAIR! 
  • Press the WindowsKEY + R from the keyboard to enter in the run mode
  • Type regedit and press Enter
  • In Registry Editor, locate the following subkey in the registry:
         HKEY_LOCAL_MACHINE\Software\Clients\Mail\Microsoft Outlook
  • Select the subkey, and delete it and close that window
  • For All MS Office versions, Click Start, click Control Panel, click Programs and Features, select Microsoft Office and then click the Change/Modify button.The MS Office windows pop up and click the option Repair and complete the instructions
  • It will regenerate the subkey and resolve the corrupt key issue
  • Open the Outlook and setup a meeting from the calendar and test the setting