The pack weighs in at 108MB and contains a couple of new security updates along with every fix, kludge and tweak previously issued for the suite. Other changes include removal of support for reading and saving legacy versions of apps like Coreldraw and Quattro, as well as older versions of Office, in the interests of security.
Fast Save in Word also heads for the gulag due to its propensity to include metadata containing content that you may not want to share with other people when you distribute the document electronically. Fast Saved documents may still contain text or comments that have been deleted from a document after saving it, causing potential embarrassment.
The pack is downloaded automatically by Windows Update, but should you feel the need, you can also read all about it and do your own download by wibbling over here . µ