All in-place archive searches are limited to 250 results
In an archive that could contain 100,000 emails going back 10 years, it is ludicrous to think that this limit is practical. Also not consistent with Exchange Server section of https://technet.microsoft.com/en-us/library/dd979800(v=exchg.160).aspx.
This limit is the most pathetic thing I have ever seen.
This limit is crazy!