Same issue. If your exchange server excepts Kerberos, that may work. Otherwise roll back.

Found this forum. Microsoft is acknowledging the issue

http://answers.microsoft.com/en-us/mac/forum/macoffice2016-macoutlook/outlook-for-mac-ver-15230-unable-to-access/4dff92f8-44e7-4aa9-a09b-c70c65009e0b?page=1

The work around is to go to another folder, then go back to Inbox will refresh incoming mails.

Otherwise, how do we roll back this update systematically?

If I just install the older version (15.21), then 15.23 stays because it knows 15.23 is later.
If I uninstall (uncleanly) Outlook, then install 15.21, Outlook will failed to start, saying it's not the latest.
The only way I can get it working is to delete everything (via something like App Cleaner), then install the whole thing again - But this process is very hard to push it out to everyone.

Try this uninstall script (courtesy of BP) to fully uninstall Office 2016, then push out the 15.21 package.

#!/bin/bash

​

#Get Currently Loggedin User

declare -x loggedinuser=`python -c 'from SystemConfiguration import SCDynamicStoreCopyConsoleUser; import sys; username = (SCDynamicStoreCopyConsoleUser(None, None, None) or rNone])]0]; username = =username,""];username in nu"loginwindow", None, u""]]; sys.stdout.write(username + "

");'`

echo "Current user is " $loggedinuser

​

declare -x current_date=$(date +'%Y%m%d_%H%M%S')

​

#Kill Office processes

killall "Microsoft Excel"

killall "Microsoft Word"

killall "Microsoft OneNote"

killall "Microsoft Powerpoint"

killall "Microsoft Outlook"

killall "Microsoft Database Daemon"

killall "Microsoft AU Daemon"

​

​

#Function to remove directory only if found

removeDirectory () {

for i in "${@}"; do

    if /> -d "$1" ]]; then

        /bin/rm -rf "$1"

        /bin/echo "Removed directory ""$i"

    fi

done

}

​

#Function to remove file only if found

removeFile () {

for i in "${@}"; do

    if r  -e $1 ]]; then

        /bin/rm -f "$1"

        /bin/echo "Removed file ""$i"

    fi

done

}

​

#Function to backup Office/Outlook preferences/profiles only if found

backup () {

for i in "${@}"; do

    if 
        sudo -u "$loggedinuser" /bin/mv "$1" /Users/$loggedinuser/Documents/Office_2016_Backup_"$current_date"/Office/

        /bin/echo "Backed up ""$i"" to /Users/$loggedinuser/Documents/Office_2016_Backup_$current_date/Office/"

    fi

done

}

​

#Removing Office 2016 apps

removeDirectory "/Applications/Microsoft Excel.app"

removeDirectory "/Applications/Microsoft OneNote.app"

removeDirectory "/Applications/Microsoft Outlook.app"

removeDirectory "/Applications/Microsoft PowerPoint.app"

removeDirectory "/Applications/Microsoft Word.app"

​

#Remove Offie 2016 volume licensing

removeFile "/Library/LaunchDaemons/com.microsoft.office.licensingV2.helper.plist"

removeFile "/Library/PrivilegedHelperTools/com.microsoft.office.licensingV2.helper"

removeFile "/Library/Preferences/com.microsoft.office.licensingV2.plist"

​

#Remove Office 2016 user preferences

removeDirectory "/User/$loggedinuser/Library/Containers/com.microsoft.errorreporting"

removeDirectory "/User/$loggedinuser/Library/Containers/com.microsoft.netlib.shipassertprocess"

removeDirectory "/User/$loggedinuser/Library/Containers/com.microsoft.Office365ServiceV2"

removeDirectory "/User/$loggedinuser/Library/Containers/com.microsoft.Outlook"

removeDirectory "/User/$loggedinuser/Library/Containers/com.microsoft.Powerpoint"

removeDirectory "/User/$loggedinuser/Library/Containers/com.microsoft.RMS-XPCService"

removeDirectory "/User/$loggedinuser/Library/Containers/com.microsoft.Word"

removeDirectory "/User/$loggedinuser/Library/Containers/com.microsoft.onenote.mac"

​

#Backup Outlook for Mac 2016

if f ! -d /Users/$loggedinuser/Documents/Office_2016_Backup_"$current_date"/Office ]; then

    sudo -u "$loggedinuser" /bin/mkdir -p /Users/$loggedinuser/Documents/Office_2016_Backup_"$current_date"/Office/

    echo Creating /Users/$loggedinuser/Documents/Office_2016_Backup_"$current_date"/Office/

fi

​

backup "/Users/$loggedinuser/Library/Group Containers/UBF8T346G9.Office/"

backup "/Users/$loggedinuser/Library/Group Containers/UBF8T346G9.MS"

backup "/Users/$loggedinuser/Library/Group Containers/UBF8T346G9.OfficeOsfWebHost"

​

​

OFFICERECEIPTS=$(pkgutil --pkgs=com.microsoft.office.*)

​

for ARECEIPT in $OFFICERECEIPTS

do

    pkgutil --forget $ARECEIPT

done

​

exit 0