Yahoo! Mail now has Dropbox built in. Now you can attach stuff from Dropbox to emails you send (even if they’re over 25 MB), or save the attachments you receive back to Dropbox.

Step 1:

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Turn on your DropBox for YahooMail

 

Step 2:

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Click OK button on the dialog

 

Step 3:

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Sign Up or Sign In to Dropbox