Search not working in Outlook 2019 since updating to Monterey 12.1 on the Mac

SCSW_2021 

That command should use a lower case 'i', and does not seem to rebuild the search index, it only turns it on.  Per the output below, a rebuild would be:

sudo mdutil -E

I'm not sure I recommend that path, just clarifying the command-line.

% sudo mdutil -a -I on

mdutil: invalid option -- I

Usage: mdutil -pEsa -i (on|off) -d volume ...

       mdutil -t {volume-path | deviceid} fileid

Utility to manage Spotlight indexes.

-i (on|off)    Turn indexing on or off.

-d             Disable Spotlight activity for volume (re-enable using -i on).

-E             Erase and rebuild index.

-s             Print indexing status.

-a             Apply command to all stores on all volumes.

-t             Resolve files from file id with an optional volume path or device id.

-p             Publish metadata.

-V vol         Apply command to all stores on the specified volume.

-v             Display verbose information.

-r plugins     Ask the server to reimport files for UTIs claimed by the listed plugin.

-L volume-path List the directory contents of the Spotlight index on the specified volume.

-P volume-path Dump the VolumeConfig.plist for the specified volume.

-X volume-path Remove the Spotlight index directory on the specified volume.  Does not disable indexing.

              Spotlight will reevaluate volume when it is unmounted and remounted, the

              machine is rebooted, or an explicit index command such as 'mdutil -i' or 'mdutil -E' is

              run for the volume.

NOTE: Run as owner for network homes, otherwise run as root.