Love the application.
I would suggest programming in a opening or splash screen.
When I select Thunderbird from my Windows desktop, there is a long delay before anything happens and I'm left wondering if the application is running or whether I need to select it again.
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What is a long delay? I have a profile with only two accounts in it and it loads almost instantly from my SSD drive. I also have a profile with 20 something accounts including many RSS feeds and it can take much longer to load, but it is also a profile of 50 odd gigabytes in size. I certainly do not want a splash screen, if anything I would like to see those resources devoted to making the load faster!