Fast flexible searches and spam filters that work better than anything else I've tried. I put up with other issues for these two things.
I don't use an offline client because I use a home desktop, phone, and work desktop that aren't the same os.
I don't use an offline client because I use a home desktop, phone, and work desktop that aren't the same os.
I am using the paid Gmail product, no idea if that makes it any different.
I assume the volume they deal in would make a Bayesian filter more effective.
I may be not seeing issues as we spent a fair amount of time using the "report spam" and "not spam" buttons when we first signed up for Google Apps, so it's been trained to our use case. It works very well for us.