We have an issue where multiple users compalined they were unable to retrive the attachments from the archived emai and when they restore the archive email they were able to open the attachments, can someone please direct me to correct way to resolve the issue. I've checked the logs on Enterprise vault server and there are no errors reported. Is there anything that i need to check on message classes?
Email retrieval fails after installing Security Patch for Outlook 2010, 2013 and 2016
I would advise you to test the workaround on one client you are facing this problem. The Outlook Patches not always shown in updatehistory. You can also check your wsus regarding this KB numbers. I guess at the moment the MS Updates are the only reason this happens.