It’s no secret that Yahoo! is overhauling all of its flagship products, including mail. The service has gotten a refresh on both the web and mobile, and on Tuesday, the company has announced a partnership with file-backup and sharing service Dropbox. The partnership will make it easier to send, receive and manage attachments in Yahoo! Mail. In case you’ve forgotten, Yahoo! Mail is still the No. 3 most-used mail service in the world behind Hotmail and Gmail. But the last time we checked, it was No. 1 in the United States. By acting nimbly, the company can add small tweaks and enhancements thanks to partnerships like this that will give it a potential edge against the competition. This is good news for both companies, specifically Dropbox. This brings a new audience to the service, which has become a mainstay in the workplace and small teams of collaborators.