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1.
What documents gather when they sit on computers for ages without being looked at.
"Delete that off the server, it's been gathering e-dust for three years now"
by SpacedJ April 16, 2008
 
2.
It's the electronic dust that accumulates on old rarely used or forgotten files, emails etc.
Dude, reply to my email, it's been weeks.
It's covered in Edust already!
by Canadian-truth August 11, 2011