Gmail's latest in a series of changes, the updated compose window, will soon go from opt-out to your only choice. Today's Gmail blog post says that all Gmail accounts will switch to the new compose window in the next few days.

If you're not a fan of the new default, Google says you can expand the new compose window to fill the grayscale background, then hit "default to full-screen" to keep it locked that way. But if you're a fan of the old look, enjoy it while you can, because it's not long for this world