
Gmail
is in my opinion one of the best creations of Google and also the best post we can choose. Not only for the abysmal amount of space offered (which virtually no one can fill), but also by all the options they give us at
Labs
. In addition to check the mail when switched off and be able to undo to a message that we have inadvertently sent among many other things, may now allow us to attach even if we are offline files (you can not send mail but simply to prepare the until we have a connection). According to comment from Google is one of the most requested features by users and from today and can be used. The good thing about this is that being able to read messages while offline, and now write to attach a file, compared with a desktop mail client virtually no difference.
A blow to popular applications like Microsoft Outlook, Thunderbird or Windows Live Mail

Why don't you make one?