This bug was reported by one of our site visitors "Jimbo" here. Thanks Jimbo for repoting this bug.
1. Open Windows Live Mail (The Desktop Mail Client not browser one) and click on "New" button in toolbar.
2. Now do not enter any recipient in "To:" text field and click on "Send" button.
3. It'll show following error message:

4. Click on OK button and try to enter recipient in "To:" text field. Yep, you got the bug. It'll not accept any text. Type anything but it'll show nothing.
5. Go further and click into "Subject:" text field. now click again in "To:" text field and type something. Now it'll accept the text.
6. One more bug. Don't follow Step 4 and when WLM will not accept any text in "To:" text field, click in message composing area and again click in "To:" text field. Now whatever you'll type in "To:" text field, will be entered into message area. Funny. isnt it?
Also check:
This article was posted by VG in following section: Windows Live.
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Riza
I use WLM but I did'nt get this bug for know. But for any case thanks and yeah its' funny.
VG
^^ Strange. Are you using the latest Windows Live Mail version?
Riza
I'm using WLM 12.0.1606. Is it latest?
VG
^^ Yep.
Adrian Bell
I get the same thing but with the Subject field if I forget to enter anything before typing the message.