I’ve included a full copy of the script at the end of this post if you just want to steal the whole thing. So I figured out my own way, using PowerShell, which I’ll spell out below. ![]() I needed to solve this problem recently, and found plenty of suggested fixes but they were either way too manual (fine for a few duplicates but not thousands) or they just didn’t work at all. The trouble with removing these if you’re on Exchange Online is the contacts have special permissions and can’t be deleted by the end user. The underlying cause of these duplicates being created has long been fixed via CUs, but the contacts remain. If you’ve been running Lync for quite a while, these duplicates may run north of 10,000 objects, which will start to mess with your Outlook performance and do horrible things to your mobile phone address book. ![]() ![]() If you’ve been using Lync (now Skype for Business) for a while, you’ll likely find that you have a number of duplicate contacts in your mailbox, due to a legacy behavior of the client auto-creating contacts everytime the client version changed.
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