People can't open the attachments I send

First, make sure you're not including either of the following symbols in your file name: ?, +

It may be that their phones are not capable of opening Word documents or another file format sent via Attach. There are a couple Microsoft Office Mobile apps that should solve the problem.

A lot of phones already have PDF readers downloaded, so sending PDFs may be best!

Parents & students may also log into their account online to print any files or documents.