You downloaded the tar.gz package, didn't you? This is called a source package and to install thunderbird using the tar.gz file, you need to do this:
1. Open a terminal and type the command:
tar zxvf filename.tar.gz
2. This will create a directory called filename. In this case it'll be thunderbird
3. Browse into the directory with the cd command:
cd thunderbird
4. To install, now run the commands
./configure
make
make install
Run these three commands one after the other. That will install Thunderbird. But, you need to have the GCC compiler before you can run ./configure
The links below should help when using YAST
http://suseforums.net/index.php?showtopic=10386
http://www.suse.de/~sh/YaST2-Package-Manager/
Cheers!
Coauthor of Beginning Fedora: From Novice to Professional published by Apress.
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