Gmail lab has rolled out a new feature from their lab; Gmail users can convert Gmail Email’s into Google Docs. This new experimental feature from Gmail lab converts your Gmail’s Email message into Google Docs with just one click. This new experimental feature will remove the things that Gmail users have to do to make a GoogleDoc from their Gmail message including copying and pasting the text from your email. just open the message you wish to convert, click the “Create a document” link on the right side of the page, and voila, you have a brand new document which you can then modify and share.
To turn on this feature, go to the Gmail Labs tab under Settings, select “Enable” next to “Create a document” and hit “Save Changes” at the bottom.
I have not got this option in settings in labs may it will take time to roll into all Gmail users