Windows Mobile Standard

Since it it so expensive I have decided to do even more research on it. I am yet to find the answers to these questions:

How long can a video be taken if it is to be email?

Are incoming calls affected when the "Navigation" software is in use?

It is going to allow an upgrade of "Windows 6"?

I alraedy know it will not open an excel file that is 4meg. Is there a waty aroung this?

By the way, I called AT&T and they could not answer these questions. The told me to log onto this web site which I thought was little different. I thought they knew everything...

Thanks,

Baildaddy