Improve performence of the message composer window

[Berthold]

I'm a big fan of Thunderbird. I try to convince friends and business owners to use Thunderbird as well. The feedback is often negative because of the very basic email composition window. Users miss:
- the MS feature “Apply Format”
- a direct command to attach contacts from the address book (extremely important for salespeople)
- automatic spell check (important for “frequent writers”).
- .....
These straightforward basic features should be added as a matter of urgency.