"Even with all of our online collaboration tools, email attachments will never go away. But recent improvements in Zoho Mail -including some made just last night!- make it even easier to deal with email attachments."
I know that Google (gmail, docs, etc) are the 900lb elephant when thinking about online well everything… But one of my favorite companies for the last few years is Zoho. With more applications, functionality, and responsiveness, Zoho just keeps on supporting it's clients with innovation (for free). If you are looking for a more robust online collaboration suite, email, and just about everything option. I'd strongly recommend looking at Zoho. Heck, even if you are Google user, stop by and evaluate Zoho against Google, I think they will open your eyes to possibilities you may not have known were available to you… (and with less privacy and ad invasion).