Click on that grey arrow at left of your email, maybe you will prompted to enter your password

Hello! Yes ofcourse it works to click, but i mean that i want all of my 3 mailaccounts expanded automatically when i startup Thunderbird.

(I want to see all 3 inbox folders directly after startup.)

Screenshot: Right now only 2 of 3 is expanded after startup.

Hope you understand my question better :( Thank you!

The content of that pane should be exactly the same on startup as it was when your closed it down. If it is not, something is probably preventing the session.rdf file from being saved, or something like ccLeaner is actually deleting it.

see http://thunderbirdtweaks.blogspot.com.au/2012/06/thunderbird-and-ccleaner-or-my-settings.html

I am using MAC OS X, I wonder if its same on mac os x?

Because it has never been exactly the same for me.

Anyone know? :(

Best regards.

As stated above, the folder pane layout should be remembered between restarts, but if it isn't, try deleting the files mentioned near the bottom of this article, beginning with "If deleting localstore.rdf doesn't help...":

http://kb.mozillazine.org/Toolbar_or_windows_layout_not_working