he office host was crashing in windows, when an add-in is being activated while the registry TabProcGrowth value is REG_SZ type and with value "0". That registry TabProcGrowth value can be under any one of 4 paths: HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Main HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main HKEY_LOCAL_MACHINER\Software\Policies\Microsoft\Internet Explorer\Main This change would fix this issue.
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The toggle for "Try the new Outlook" disappeared in the new outlook for me. I tried adding the registry key for the outlook toggle:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General\
DWORD HideNewOutlookToggle = 0 (not hidden) or 1 (hidden)
as outlined here: -show-or-hide-try-new-outlook-toggle-option-in-microsoft-outlook-titlebar/
but even that did not give me the option to revert back to classic.
Thank you for this fix! This worked with a small tweak for Windows 10:
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