Add 'Fix Error 0x80040115 in Outlook DNS Flush Guide'

Fix-Error-0x80040115-in-Outlook-DNS-Flush-Guide.md

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+After hitting Enter, you might not see any visible feedback. This lack of response simply means that the command was successful. Occasionally, users may flush their [recreate Outlook profile step by step](https://campusbiasharaclub.com/read-blog/1023_outlook-hangs-when-synchronizing-subscribed-folders.html) DNS cache only to realize that issues persist, such as slow-loading sites or connection errors.
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+Occasionally, users may flush their DNS cache only to realize that issues persist, such as slow-loading sites or connection errors.For Mac users, you can use Terminal and run the command `sudo killall -HUP mDNSResponder` for macOS Mojave and later versions