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This can be done by running outlook.exe /safe in the Run command interface. You can solve this issue by running Outlook in safe mode. Run Outlook in Safe ModeĪnti-virus program or fire walls may scan emails and cause issues while opening attachments. So update your Outlook to the latest versions to get rid of slow email attachment opening problem.

The newer Outlook versions can handle more emails and their large-sized attachments more effectively than the older versions. Users who are using older versions like Outlook 20 may face delay in opening attachments. Now, close the Outlook application and restart it.Check the Use Cached Exchange Mode checkbox and it will enable the cached mode for your Outlook.Select your Exchange account in the E-mail tab, and click the Change option.In Outlook, select File>Account Settings> Account Settings.Otherwise opening Outlook attachments may become slower.

If you are using Outlook with Exchange account, then it is recommended to enable Cached Exchange Mode. Note: You will have to disable the protected view property for every Office application separately. So it they will be opened faster in Outlook. Now Word files will not be protected as an attachment in Outlook application.
