From Bugzilla Helper: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.8) Gecko/20020204 BuildID: 2002020406 I have a couple of addresses that appear several times in 'Collected addresses'. Looking at them, I see a pattern: the addresses contain some uppercase characters. There are no all-lowercase addresses listed more than once. Reproducible: Didn't try (just going from the evidence) Steps to Reproduce: 1. Receive several e-mails from someone with some uppercase characters in their e-mail address. Actual Results: Address is duplicated in 'Collected addresses' (even if address is also in 'Personal address book') Expected Results: Address should only appear once

dup of 121478 *** This bug has been marked as a duplicate of 121478 ***

Yup indeedy, it's a dupe. Might I suggest that you include the phrase 'collected addresses' in the summary of bug 121478 - should help prevent more dupes.