We were able to reproduce this issue at our end with the latest version of Aspose.Email for .NET. It seems that searching a PST with message body is not supported at the moment. We have logged this issue for our Product team in our issue tracking system as EMAILNET-34853. Once the issue is investigated and there is some information available about it, we shall write to you here.
Please share the exception message that you get after executing the sample code. Please provide a sample file as well, so that we can investigate this further.
We were able to reproduce this issue. It has been logged as EMAILNET-39127 in our issue tracking system. We will update you here as soon as additional information is available.
The issues you have found earlier (filed as EMAILNET-39127) have been fixed in this update. This message was posted using BugNotificationTool from Downloads module by MuzammilKhan