SSRS - Link to Open Outlook and compose email
SQL Reporting Services is a very powerful tool to build Reports. 
In one of my projects, my client wanted to have a link in the report so that when user click on the link it open outlook and compose an email with a pre-define emails and subject so that user can compose the email and don't worry about recipients or subject line. This is how it can be implemented:
- Add a Text box control to your report
 - right click on text box and go to properties
 - Go to "Action" tab within properties
 - Click on "Go to URL" option
 - click on Fx" Button to the right side of URL drop down (see picture below)
 
- put this line there
 
 ="MailTo:" & "[EmailAddress]" & "?subject" & "[Subject Line]"
  ([EmailAddress] and [Subject Line] should be replace by email and subject that you like the email composed with