Hi @Eleni
I also have the same issue/question
if i understand the explanation correctly microsoft only supports "prefix matching" when searching, but doesnt currently support "Suffix matching" ?
is that right.
i have exactly the same results when searching for Invoice numbers, when i ignore the prefix (such as the INV1234567, and searching for 1234567, and dont get any results when an email includes the full string.)
not sure on the design, but i would imagine prefix and suffix matching should be considered when searching for partial matchs
Cheers
Dillon