I am not able to send either. I'm on Win XP sp3. If I hit new/reply/forward and it opens in tab compose I can compose just fine but when I hit send everything grays out and nothing goes to the outbox. If I open it the email I composed (which is now in draft) and try to send it still will not send.
In order to send mail now I have my options set to always compose in a new window. Opening in a new windows however goes to text format even though I do have my settings set to compose in HTML. If I compose in text format in a new window it will send, however if I manually change to compose in HTML it will not send.
I have uninstalled/reinstalled, rebooted, waited till the next day, uninstalled other email apps just in case there was some strange conflict...nothing worked. I did find a few bug reports listed.
Bug 43882 – compose from tab won't send mail Bug 44023 – cannot send in tab compose
Becky