Gmail - letters disappeared before 2008

Perhaps this is not a topic for Habr. But I'm shocked. And don `t know who to turn to.

I have been using gmail for many years - since at least 2006. I recommend to everyone.



And today it is useful to look for letters from 2007 and with HORROR found the lack of any letters until 2008. All correspondence starts from January 2008.

How to be? I am disarmed and discouraged ...