ashutoshgupta.umd,
I attempted to set Outlook as the default mail client and "email" was then removed from the contextual "share" list.
So, I also created an automator script to do this task. This may be an old thread, but this may help someone:
1. Create a Service script
2. On the pulldown menu marked "Service receives selected..." Choose "Files or Folders"
3. Search for Outlook in the search bar above the list of available script pieces.
4. drag "Create New Outlook Mail Message" to your script work area.
a. Enter any information you want to be defaulted (I left it all blank)
5. Drag, "Insert Content into Outlook Mail Messages" to your work area.
a. Choose a location for it to insert within the messages you will create (I chose Top of Message)
6. Choose Save and give it a meaningful name. I chose to name mine, "Share In Outlook".
After a few seconds (maybe 5 or 10) it should appear under the "services" option when right-clicking on a file in the finder.
(I am running OS X 10.9.5)