The Worklife Rewards promotion is back. I posted this several months ago- so maybe those that did it last time can let us know how it worked out?
You need to be a Worklife Rewards member (it is free) so you can provide the number from your account.
Then just fill in the form either providing or updating your email. You will get $5 to your account in about 4-6 weeks.
Not sure if this will work if you are just updating your e-mail. Here’s what it said in the fine print: $5 back in Worklife Rewards ® offer is valid for email addresses provided at http://www.officedepot.com/emailpromotions between 10/26/10 – 11/26/10 by new or existing Worklife Rewards ® members without a valid email address on file.