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Feb 18, 2014 · How to Remove Gmail Account from other's Device | Logout Gmail - Duration: 2:38. WebbyFan.com 352,160 views. 2:38. How To Add Gmail Account on Windows 10 Tutorial - Duration: 1:48. Recover the admin account and lock/delete all the users. There is no reason to not be able to get into the admin dashboard just because the MX records have changed. It's entirely possible he's just using the wrong URL if there used to be a vanity name setup. Pretty sure https://admin.google.com should work.
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