Outlook mailboxes disappear after installing KB4532695

Microsoft released the second round of updates of the year 2020 just two weeks after Patch Tuesday.

This cumulative update is called KB4532695 is available for Windows 10 version 1903 and Windows 10 version 1909.

This cumulative update is mostly composed of fixes, the most noticeable one being the File Explorer issue that has been plaguing users for almost 4 months now.

KB4532695 affects the use of Outlook’s mailboxes

Unfortunately, this cumulative update is not without its flaws. Just a day after hitting live, users have been reporting on official forums that the cumulative update makes their Outlook mailboxes disappear from Mail:

After applying the “January 28, 2020-KB4534132 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 1903 and Windows Server 1903 RTM and Windows 10, version 1909 and Windows Server, version 1909″ update, all four of the outlook.com mailboxes have disappeared from Mail, and only the gmail mailboxes remain.  This is grossly unacceptable behavior.  Running the “January 28, 2020—KB4532695 (OS Builds 18362.628 and 18363.628)” update leaves the mailboxes still missing.

Curiously enough, nothing in the KB4532695’s changelog seems to indicate any change, improvement or bugfix related to Outlook, Mail, or mailboxes in general.

What makes this issue all the more confusing is that if users within Mail‘s settings, they will see that all of the mailboxes are still registered there.

Admittedly, since the mailboxes still show up as registered, it might be simply a visual bug.

Whichever the case, Microsoft will not release any new updates until the February Patch Tuesday updates. This means that if you too encounter this issue, might as well uninstall the cumulative update.

What’s your take on Microsoft’s latest cumulative update issue? Share your thoughts in the comments section below.

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