Outlook 2013 quitting when sending to certain recipients

Have a very strangle issue that I hope some of you could help with? I have a user with Outlook 2013 running 3 hosted exchange accounts. Has been working fine for 6 months but when he sends or replies to 3 separate external users in his contacts list, Outlook 2013 quits and restarts.

I have repaired/re-installed Office 365. This hasn't helped.

I've deleted the 3 contacts from his contact listing, send them e-mails via typing in the addresses manually and they send OK.

If I add these contacts back to his contacts listing and send again - Outlook quits and restarts.

Any idea greatly appreciated.

Regards Gene
doodledaddyAsked:
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JohnBusiness Consultant (Owner)Commented:
No good on the problem computer and OK with a different computer / OWA indicates a corruption of the problem computer.

1. Scan very thoroughly for viruses and malware. After the scan with your software, scan with Malwarebytes.

2. Run System File Checker. Run SFC /SCANNOW and allow to complete. Restart after completion.

3. Run a Windows Repair Install if nothing else works. Be sure to back up first.

.... Thinkpads_User
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Vasil Michev (MVP)Commented:
Funny one. Have you tried it with Outlook running in safe mode? Or another machine? And clear the autocomplete entries just in case.

You can also try adding those as external contacts to the GAL instead of Outlook contacts? Or just create new contacts from scratch for them, without importing.
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JohnBusiness Consultant (Owner)Commented:
Also try Outlook in a new, test, different Windows User Profile (Account). Since it was working, there could be profile corruption causing the issue.

There were Office 2013 updates last week. Did you do these updates?

.... Thinkpads_User
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David AtkinTechnical DirectorCommented:
If the email address is cached, delete it from the cache and try re-sending.

Can you also try sending from OWA to see if it sends successfully.
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doodledaddyAuthor Commented:
Hi Guys,

Thanks for your comments. Have creates a new Outlook profile and added the e-mail accounts again and it still happens.

Have created a new user on the PC, added the accounts again and it still happens.

Have created the accounts on another PC and it doesn't happen and I can send to these users using OWA OK.

Will have a go at the safe mode option but it looks to me if there is something else on the PC that is affecting this - any ideas appreciated.

Regards
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Vasil Michev (MVP)Commented:
Safe mode should take care of ruling out any additional addins (Just type Outlook /safe in the run box). Also, disable any AV software you have there. Lastly check any GPOs/additional configuration that might be specific to this machine.
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doodledaddyAuthor Commented:
Hi All,

Thanks for all your input. Finally got rid of the problem by removing various "helper and fix it programmes and utilities" that there user had on the system.

There were a few so I didn't get to find out which was the culprit. Still find it very strange that the user could send to all but 3 users - but there it is.

Malwarebytes didn't find anything in this instance.

Thanks again for all input and suggestions

Regards
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doodledaddyAuthor Commented:
Thanks again to all
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JohnBusiness Consultant (Owner)Commented:
@doodledaddy - You are most welcome and I was happy to help.

... Thinkpads_User
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