can I use send to mail recipient with the mail app?

Good grief, people, it's not rocket science. If you have a file open in a Metro app just bring up the Charms, select SHARE and choose your method of sharing, e.g., MAIL.  It works fine.  It works just like on the phone.  Get the "Send to:" out of your head when it comes to Metro.  Think mobile, not desktop.

ScubaDog, I don't think you understand what this conversation is about. I doubt I'm the only one who will no longer bother reading your responses.

We aren't talking about functionality of Metro apps. We are talking about the obvious disconnect between Desktop and Metro. Perhaps you should reread the original post.

I read it just fine.  I believe that you folks aren't understanding that, YES, there's a disconnect between Metro and Desktop and it's intentional.  Metro is where Microsoft is going, like it or not.  The functionality that has been discussed here is available on the Metro side, it's just a different method of thinking about it.  Microsoft made no secret about the fact that you can still get what used to be the Windows Live Essentials, which included the desktop Mail program, and install it on the Windows 8 Desktop.  But they're TRYING to get everyone to embrace the Metro side.  Such concepts as "Send To" is an old desktop thing.  "Share" is the mobile concept--just like on the phones and tablets.  As I said, the "disconnect" is purposeful.  You clearly don't like it, and that's fine.  There's nothing stopping people from just staying with Windows 7 or installing legacy software onto the Windows 8 Desktop side and living there.  I think it's silly, but then I have long wanted to see the end of the old desktop.  I'm a power user and I have my entire podcasting and music studio migrated to Windows 8, and I've no issues that weren't simply attributed to a small learning curve.

I completely disagree that these are stupid changes.  I, too, grew up from the old TRaSh-80 days.  And I don't pretend that the Metro side was kicked out fully mature, ether.  I worked with the Developer Preview, the Consumer Preview and the Release Preview, and watched the various bits come into fruition.  Some things I agree with, some I don't.  But I GET them, and I'm not stuck in the past.  I WANT this to move forward.  I've not lost a single bit of functionality in transition because I've purposefully begun to divorce myself from old-school.  It's time to put down the buggy whip.

I think you're mistaken in saying you can just share any file. You can't because there's no native metro file explorer, so I can't just navigate to any file I want to and pull up the Share menu.

On that note however, you could easily download a 3rd party file explorer that allows sharing of files.

This issue that they're talking about is a bug though. In browsers like Opera, it detects that the PDF application is the default application, but won't open any PDFs Metro-side. Same issue here, where Windows Send-To detects that the default MAIL CLIENT is the Metro Mail application, however the Send-To(which uses the mail protocol), does not work. 

There's absolutely no reason it shouldn't work.