Hi,

This problem may exist due to following reasons:

1.) If email contains a large sized attachment
2.) If Outlook data files are indexed incompletely
3.) If Add-Ins are not installed properly in Outlook
4.) If PST files are corrupted

To resolve this issue, you need to remove Outlook from index. Follow the below steps:

Start Outlook >> click File >> click Options
Click Search >> click Indexing Options >> click Modify
Deselect Microsoft Outlook >> click OK >> click Close

For further assistance, feel free to contact.


Thanks & Regards
Anjlua