Hi!
After hours of trial and error I found a few thigns that have worked for me -
1. if you remove all spaces from filenames, then the files will attach & send
2. if you configure your hotmail account to work via your mac mail - this works too (you can only see your inbox, but if its urgent, this is a quick fix
3. Uninstall silverlight & DONT reinstall it - then hotmail works as we're used to :-) This is the option I prefer (having experimented with the other two). I dont know when I'll need Silverlight for a website, so until I go to a site that prompts me for it, this is the best solution I can find :-)
Some good uninstall instructions are on www.microsoft.com/getsilverlight.
Alternatively, a quick tip ... in Finder, go to macintosh hd -> library -> internet plugins. Move sliverlight.plugin to the Trash & delete the trash. Quit safari & re-open.
Hope this helps you too :-)
Regards,
Katrina