Update the TinyMCE paste plugin to the latest development version. It includes a fix for pasting from Word: removes inline comments and change tracking.
Changeset: https://github.com/tinymce/tinymce/commit/f8cffdf34287afaa54ffbf7d6b0eb7b22a8c27ac
Fixes #27771
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git-svn-id: http://core.svn.wordpress.org/trunk@27920 1a063a9b-81f0-0310-95a4-ce76da25c4cd