Outlook Contacts Duplicating Themselves

By Jbencsik ·

We have a user at one of our client sites who's running Outlook 2007 connected to Exchange 2008. Last week, an odd thing started occurring. Two or three of her contacts in Outlook started replicating themselves so that at first, there would be just four or five duplicate entries. This quickly spiraled out of control to the point where their ended up being thousands upon thousands of the same contact entry. This only occurs with a couple contacts.

She's on an XP machine and I ran through all the usual steps of cleaning the desktop up, running AV, Malware Bytes, CCleaner, and a few other things.

A few weeks ago, she was receiving an error stating that her junk mail senders list was full, even though there was nothing on this list. I forget how exactly I fixed this as I ran through a what seemed like a million different things but I believe I logged into her OWA account, checked the senders list, turned the filter off and then back on.

This duplicate contact thing is driving me nuts though as I can't find anything on the interwebs related to it. She also has a blackberry and I'm wondering whether there's some sort of weird synch issue occurring, but it doesn't make sense that it would only happen to a handful of contacts. I also have cached mode turned off.

Next thing I'm going to try is rebuilding the system but I'm trying to only do that as a last ditch effort.

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blackberry sync issue

by normajean47 In reply to Outlook Contacts Duplicat ...

I have found a few sites on the web talking about the issue of syncing a blackberry with Outlook and getting duplicate contacts so likely this is what is happening to your user. is the link where I found a possible solution if you want to take a look

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junk mail senders list was full

by michael.hellyer In reply to Outlook Contacts Duplicat ...

Just to add to this thread. I discovered that it was duplicate contacts that were causing the junk mail senders list to to get too full. If you login to OWA and check the junk email settings, you will probably see that "Also trust e-mail from my Contacts " is ticked. Untick this and the dialogue box stops popping up :). Sort out your contacts and you Blackberry contacts syncing issue and then return to OWA and the junk email settings and retick "Also trust e-mail from my Contacts". Voila.... problem sorted....

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