we're just finishing migration to Exchange 2013 and found some Outlook 2013 clients (migrated from Exchange 2010) can't communicate with Exchange 2013. even if i recreate the Outlook profile.

what worked is to reinstall Office 2013.  just want to get ideas why a reinstall fixed the problem.

same outlook proxy is there in the account settings.

Hi,

What was the symptom that Outlook couldn't communicate with Exchange 2013? Could you please detail this a bit?

If the Account Settings are completely same before and after the reinstallation, we can say the cause is not on the Exchange side. While I can't guarantee the root cause based on the provided information. A reinstallation fixes the corrupted or missing components/files in Office, but it's hard to say what has been fixed during the reinstallation.

If you still have some Office 2013 clients that have not been reinstalled, try to run Microsoft Office Configuration Analyzer Tool to quickly identify problematic configurations in Outlook:

https://www.microsoft.com/en-us/download/details.aspx?id=36852

Regards,

Melon Chen

Forum Support