I used Thunderbird for a long time and then switched to Sylpheed. For one its about as good an email client as Thunderbird. That's all I really used TB for. If

I used Thunderbird for a long time and then switched to Sylpheed. For one its about as good an email client as Thunderbird. That's all I really used TB for. If I want to use a calendar TB is not my first choice. I would rather use something along the lines of a project manager that has gnatt charts etc. So for email Sylpheed is elegant and lightweight and focused. I check my inbox and get my mail done then close it down and get back to what I was working on. Where as with TB I constantly had it open in the background and ended up messing with calendar and to-do more or less procrastinating.