Ok, got a reply which i have copied and pasted below.
Well you don't say what version of Office you are running and I am running the most current version of both Office and Mavericks and I can confirm that it doesn't work.
Since I never used the feature I can't tell you when it went away. Maybe someone else who is still running Snow Leopard, Lion, or Mountain Lion can tell us when the feature broke. It doesn't now work with Mavericks so did it work in all of the other versions?
Being that it is broke now and most likely, if rumors can be believed, that Microsoft is possibly working on the next release of Office I doubt you will see this fixed with Office 2011. So, save the slides out as Pics and then import those pics into iPhoto... a two step operation.
I copied them to desktop, opened the folder, highlighted them and then chose open with iPhoto (it wasn't a listed option so i found it under other apps). It downloaded them into a new event and done. A bit long winded compared to the now unavailable "share" but at least it gets it done. Hopefully Microsoft will fix it but I won't hold my breath.
Thanks for the help.