I always wonder why everyone keeps trying to force feed us Thunderbird. After a few years in outlook you may hate the price but the interface is so familiar and everything is so easy to get at . Thunderbirds inteface is a mess . I love open source but just like gimp is int Photoshop so is Thunderbird not outlook so what to do .
The options are either give in to Thunderbird or shut up and put up with pricy bloated Microsoft outlook . Took a while and finaly found an Outlook clone . The name is eM client this is a lightweiht client . The largest downside is that it takes like forever to install. But its lighter that outlook and when you are coming from outlook you can import the .pst data file or import the .pst file .
The following is a chart comparing the two
1. Outlook clone.
2. There is a free version.
3. There aren't many limits to the free version.
1. For commercial use you have to use the Pro version.
2. The free version limits you to two accounts.
3. You need to register for the free key and then activate.
Other alternatives to Outlook and Thunderbird
1. Zimbra Desktop
2. Pegasus Mail