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Outlook 2016 windows 7 connectivity issue for users in office 365

Benard Mwanza 1,001 Reputation points
2022-03-15T09:30:39.367+00:00

I'm having issue with some of my users whom are in office 365 not able to connect to office 365 mailbox using outlook client 2016

The users are in windows 7

Outlook on web is okay, they can send and receive emails.
AD Connect sync is health.

This issue just started abruptly, everything was working fine.
Now outlook client 2016 has a connection status of disconnected.

What could cause the issue?
183156-outlook-connectivity-issue.png

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  1. Aaron Xue-MSFT 2,586 Reputation points Microsoft Vendor
    2022-03-16T05:16:09.3+00:00

    Hi @Benard Mwanza ,

    Do the users in windows 10 get the same error?
    If only the users are in windows 7 get the connectivity issue.

    The issue may occur with the TLS1.0 is not supported. And the TLS 1.1/TLS1.2 are not enabled in windows 7 by default.
    Please follow below document to enable the TLS1.1 and 1.2 in windows 7.
    https://support.microsoft.com/en-us/topic/update-to-enable-tls-1-1-and-tls-1-2-as-default-secure-protocols-in-winhttp-in-windows-c4bd73d2-31d7-761e-0178-11268bb10392#easy

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