Settings that typical Outlook users want when moving to Thunderbird.

Tools > Options >Composition
Check Forward message Inline
Check Configure text format behaviour - send message in both plain and HTML

Install Quota extension
Install Add BCC button extension


Account settings > Server settings
Check for new messages every 2 minutes

> Composition and addressing
> Automatically quote orgininal message select "start my reply above original quote"

Offline & Disc space
> Check "Make messages in my Inbox available offline"

> Check "When I create new folders select them for offline use."

Junk mail controls
> Trust junk mail headers set by "spam assasin"

Set Signature.