Whose logo is this, asking me to sign in?

[old john]

I've just migrated files from a back-up made from a 2011 27" iMac on to a new one. Once the migration finished and I logged into my account, a blue window with the icon of an open, white box appeared and asking me to sign in or sign up. The icon seems familiar, but there's nothing to tell me which organization I would be signing into or up to! Any ideas which organisation was unfriendly enough not to introduce itself?

 

[arkitect]

DropBox

 

[old john]

Yes, thanks arkitect, I should have remembered! It suddenly appeared over and obscuring an invitation to update Garmin Express and I was so relieved to get back all my old apps such as Microsoft Office, EyeTV and so on that DropBox didn't occur to me. I have to say that the Migration application worked very well. I do have some configuration and logging on to do, but what a relief to have practically everything back.