Outlook name resolver keeps breaking

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Outlook version
Outlook 2013 64 bit
Email Account
Exchange Server

Really hoping someone can help us as this problem is appearing more and more in our organisation.

We have a mix of Outlook 2010/2013 and it is happening on both versions. When you type a name in the To field, outlook usually auto-suggests the remainder of the name. This works for a while, then all of a sudden it breaks and no names are being suggested by outlook. This means you then need to hit Alt-K or Check Name for it to complete the name.

A reinstall of Office works only for a short time before it breaks again.

Any suggestions please?


It's possible the list is corrupt. Rather than reinstall, clear the autocomplete list in File, Options, Mail - its near the bottom. You'll need to work on rebuilding it, but it should stick this time. If it doesn't, what antivirus do you use? What addins are installed?
Thanks Diane. The reset of the auto-compete list didn't stick unfortunately. We are using System Centre Endpoint Protection for our anti-virus. The add-ins are:

Business Connectivity Services Add-In

iCloud Outlook Add-In

Lync meeting add-in for MS Office 2013

Microsoft Exchange add-in

MS Sharepoint Server Colleague Import add-in

OneNote Notes from Outlook Items

Outlook Change Notifier

Outlook Social Connector 2013


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