Speed is important for the Gmail engineers, because they feel it’s important for the users. For that reason they’ve introduced a new compose and reply that pops up in a separate window:
This way, when you need to refer to another email, watch for new emails coming in or want to work on multiple messages and save them, you can do that very efficiently in the Gmail interface.
Next to being more efficient, the new compose/reply window allows for easier message writing: the controls move out of the way when you don’t need them, so you can focus on your message:
The same goes for replying to messages: you are now able to write a reply where the window expands vertically, keeping controls and such in sight. The new compose/reply will be rolled out as a preview at first, and will be available to all users within a few months.
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