There is a bug (in 6.0 and still in 6.01) with attachments for files that have names with accentuated characters when you drag and drop them from an e-mail to the Desktop. For example if you have an attachment called éric.jpg, when you drag the file to the Desktop, you will get two files, one correctly called éric.jpg and the other one with a different garbage character instead of the “é”. Only the badly named file one opens correctly.
The drag and drop of multiple files from the Desktop to a message now works properly, attaching the correct number of files. If would be usefull to be able to the same from the message to the Desktop.