With the new influx of email from the Exchange Calendar, users sometimes have trouble locating meeting request emails. There are several ways of accomplishing this in Outlook 2013.
Each folder can be arranged by Type to display messages. This will group all meeting requests together in a folder for easy viewing.
You can arrange any folder by type. For example, you can do this to find meeting requests in your Inbox, that you have not responded to, and locate them in your Deleted Items, after having responded.
If you don't want to have to arrange multiple folders by type to locate meeting requests, you can create a search folder that will populate with meeting requests from all folders.
Your Search Folder will now be created. This will also populate with meeting cancellations, in addition to requests. You can Arrange by Type as shown above within this folder as well, to separate cancellations from requests.