If you had a Dropbox account in mid-2012, your email address and password may be compromised.
Hackers obtained around 68 million email accounts at that time – and it was recently revealed that passwords were also at risk. The database was sent to Motherboard by the breach notification service Leakbase.
In a blog post, Dropbox wrote, "If you signed up for Dropbox prior to mid-2012 and haven’t changed your password since, you’ll be prompted to update it the next time you sign in."
The forced reset is a "purely preventative measure," according to the company.