This is how to fix your missing Right-Click Context Menu option. When you rebuild your profile this sometimes happens.
Click Start, type shell:sendto and press ENTER
Create a new text document (Right-click - New - Text document)
Rename the text file to Mail Recipient.MAPIMail
Click Yes when you see the following message:
If you change a file name extension, the file may become unusable.
Are you sure you want to change it?
Note that after renaming the file, the .MAPIMail extension hides automatically. The Mail Recipient entry should now be restored to the Send To menu.