One of my colleagues here has an apostrophe in her email address. I've never seen that before, so I went to check if that is a valid character. It is, for sure.
Still she cannot log on to [ourcompany].sharepoint.com, because of a javascript error (no details: it's occurring at line 0, char 0, code is 0 too and the error is "Script error". The URL is https://secure.aadcdn.microsoftonline-p.com/ests/2.1.4146.1/content/cdnbundles/jquery.1.11.min.js)
I'm pretty sure that it's because of her email address, which is like firstname.d'lastname@company.com. Somewhere a string is not properly handled in js.
How do I request Microsoft to fix this error? It's probably not very frequent, but definitely can impact all corporate customers.