Search in outlook 2016 shared mailbox is not working

Hello together,

I've found a solution that works for us.

With the installed O365 version 2103 (Build 13901.20462) 32bit and Outlook Version 16.0.13929.20296 from the Monthly Channel we've had the same issues like you have. The search in the shared mailboxes doesn't find something in the subfolders.

But as soon as I've installed the 64bit office version 2008 (Build 13127.21506) and Outlook version 16.0.13127.21452 from the semi annual channel the issue was fixed. Even in the online archive of the shared mailboxes we're able to search in the inbox and subfolders.

I've created a new config xml file for the Office Deployment Toolkit with using "https://config.office.com/deploymentsettings", activated the option for uninstalling previously installed office versions AND upgrading to the new architecture (from 32 to 64bit)  and reinstalled office with running "setup.exe /configure configuration.xml" on cmd.

This was tested on 3 clients and an outlook instance on a terminal server.

Here's the config.xml:

<Configuration ID="d0f3cb44-4bdf-4bd0-9726-3034e2b16aea">
<Add OfficeClientEdition="64" Channel="SemiAnnual" Version="16.0.13127.21506" MigrateArch="TRUE">
<Product ID="O365ProPlusRetail">
<Language ID="de-de" />
<Language ID="en-us" />
<ExcludeApp ID="Groove" />
<ExcludeApp ID="Lync" />
<ExcludeApp ID="Publisher" />
<ExcludeApp ID="Teams" />
<ExcludeApp ID="Bing" />
</Product>
<Product ID="LanguagePack">
<Language ID="de-de" />
<Language ID="en-us" />
<ExcludeApp ID="Bing" />
</Product>
</Add>
<Property Name="SharedComputerLicensing" Value="0" />
<Property Name="SCLCacheOverride" Value="0" />
<Property Name="AUTOACTIVATE" Value="0" />
<Property Name="FORCEAPPSHUTDOWN" Value="TRUE" />
<Property Name="DeviceBasedLicensing" Value="0" />
<Updates Enabled="TRUE" />
<RemoveMSI />
<AppSettings>
<User Key="software\microsoft\office\16.0\excel\options" Name="defaultformat" Value="51" Type="REG_DWORD" App="excel16" Id="L_SaveExcelfilesas" />
<User Key="software\microsoft\office\16.0\powerpoint\options" Name="defaultformat" Value="27" Type="REG_DWORD" App="ppt16" Id="L_SavePowerPointfilesas" />
<User Key="software\microsoft\office\16.0\word\options" Name="defaultformat" Value="" Type="REG_SZ" App="word16" Id="L_SaveWordfilesas" />
</AppSettings>
<Display Level="Full" AcceptEULA="TRUE" />
</Configuration>

Hope that helps you out a little bit.

Greetings from Germany,

Michael