Add Meeting Request to Outlook when added in SharePoint 2010 Calendar:

Step one:

Create a column in calendar list... I have used ical.

Step two:

Create a variable in the designer

Add these details to the variable

http://sharepointsite/sites/sitone/_vti_bin/owssvr.dll?CS=109&Cmd=Display&List=LISTID&CacheControl=1&ID=ITEMID&Using=event.ics

Then update this variable to the ical column

Step Three:

Send email to the person who is needed to send the meeting request

Set this ical column link to add in outlook.

Step four:

 And when we click the link the meeting request opens in the outlook and save and close to add the meeting request in the calendar :)