When you try to sent a new email and want to add an attachment nothing happens in google chrome.
There is a simple fix for this issue and that is to simply run this .reg file:
chrome-showmodaldialog
Or change it yourself:
[HKEY_CURRENT_USER\Software\Policies\Google\Chrome\EnableDeprecatedWebPlatformFeatures]
“1”=”ShowModalDialog_EffectiveUntil20150430″
Re-open google chrome and the OWA and it should work!