Last evening, for a few hours, I was unable to access to the content of my gmail account.

I am on TT&T and never encounter this since 3 years

But surprisingly, all my mail was accessible either through Thunderbird or cellphone (DTAC).

Any idea?

Here you can read the answer to your question:

http://news.bbc.co.uk/2/hi/technology/7907583.stm

Here you can read the answer to your question:

http://news.bbc.co.uk/2/hi/technology/7907583.stm

Thanks for the link...

So, I was not alone!

Here is what Google has to say about it:

http://gmailblog.blogspot.com/2009/02/upda...ail-outage.html

The good thing about GMail is that all of Google is run on it. That is, all Google employees use GMail for their work email. So if there is an outage, you can be sure it will be noticed and fixed as quickly as possible. They eat their own dog food.