The exact reason of this error is still unknown though but there are a couple of things that might cause this problem like corrupt or incomplete spotlight indexing, one of the parent folders being in privacy tab, Outlook profile folder being stored at a wrong place and several others. Since it can happen because of a lot of things, there are multiple methods that you can try to solve this. So, go through each method listed below and check whether the problem is solved after following each method.

Method 1: Remaking Outlook Profile

Sometimes deleting your current Microsoft Outlook profile and recreating the profile solves the problem. The steps for deleting and recreating the Outlook’s profile are given below. Once you add the account, check the search results once the emails are synced and imported.

Method 2: Moving Message to another Account

This isn’t a solution but more of a workaround but it works for plenty of users. Basically, if you move all of your message, that are having this problem, to another temporary folder within the Outlook and then move them back to their original folder then the search works. This is because it forces the Outlook to re-index them in the search and they start to appear in the search results. The steps for performing this are given below Once you are done, check the search results and it should work fine. If you want to delete the temporary folder that you created then right click the folder, select delete and then confirm any additional prompts.

Method 3: Check Spotlight Privacy Tab

Make sure that you’re Outlook Profile or any of its parent’s folder aren’t in the privacy tab of Spotlight. If your Outlook Profile or any of its parent folder are displayed in the Spotlight privacy tab then Spotlight won’t be able to search. So, remove them from the privacy tab of Spotlight and try again. To remove your folders from the privacy tab of Spotlight, follow the steps given below Once you are done, quit the system preferences and wait a little bit because it will take some time to re-index the Spotlight. Once the re-indexing is done, check if the search is working again or not.

Method 4: Fix Corrupt Spotlight Index

If nothing else worked then it’s very likely that the Spotlight index may be corrupted. There are some steps that you can take to re-index the Spotlight index which will solve this problem if the problem is caused by the corrupt Spotlight index. The steps are given below On the recent versions of Windows the “-g” doesn’t work anymore, therefore, try the following command if the above one doesn’t work for you and proceed with the steps below: and press Enter. Don’t forget to replace “<user_name>” and “<my_profile_name>” with your computer’s username and Outlooks profile name (like Main Profile) respectively. Note: -g means the default install location of Outlook and the address after –d1 is the default path for your profile folder. If you installed your outlook in a custom location then substitute your custom path in place of –g. Or, if you changed the path of your Outlook Profile folder then substitute that path after –d1. Wait for it to complete because it will take some time to re-index the Spotlight. Once it is done, check the search again.

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