title: msgraph api, filter shared mailboxes by a search string
body: <p>Is there a rest api in msgraph which I can use to filter a list of shared mailboxes based on a given substring.  My idea is that if I am given a string <code>test</code> I should be able to search all shared mailboxes which contain the given string <code>test</code>.  I searched and went through the msgraph documentation but I didn't find an endpoint which allows me to do this.  I can read the messages but cannot do a search for the available mailboxes.</p>