Microsoft is participating in some April Fools humor today.  If you log into Office Online (previously office web apps) and open a word, excel, or powerpoint document, the familiar Clippy will appear asking “Remember when we used to write letters together?”  You have the option to tweet the message out.

Here is a screenshot:

Read our own April Fools story: Shocker: Former Windows Chief Steven Sinofsky to Join Apple; Will Work on a “Re-imagined” MacOS