"Send to" email receipient in Excel problem

Hello,
I'm trying to get some help with one issue in Excel.
OS I'm using is 10.5 and Excel version is 2004 (11.3.7 I believe).
My default email client is Mozilla Thunderbird 2.0.0.9 and in Mail general settings it is set as a default client.
When I open .xlt template , type some text, get my document ready and want to email it straight from Excel by going through File-Send to-email , it's all greyed out , I don't have any email client to choose. What is causing it? How do I get Excel to show my Thunderbird in "Send to" so i can use it?
I was able to do that in Windows no problem.
Any help would be much appreciated.
And since I'm here, I'll ask one more thing. I've been using Dell 2001 FP monitor as my second display and actually trying to use it as a primary. Since no driver allows me to have my "windows" options for nvidia drivers, I have to drag everything manually over to dell monitor. I can deal with that, but is there a way to setup excel to always open on a second display with the toolbars I WANT opened as well?
Thank you very much for help,
Tom.

 

anybody with the same problem?

Guys, this is for my boss, he just started using mac and I need to solve it, please...