This is helpful if you want to organize groups of people or all correspondence associated with one particular thing, like buying a new house.

WSJ: Review of Cloze: An Email Inbox That Knows Who's Important

In one of the most significant shifts in the move from mail correspondence to online, the RBS Group has been writing to seven million customers informing them of the shift to quarterly statements.

BBC: RBS and NatWest cut back on paper account statements