7:00 CST: getting reports that users are unable to access email via Outlook and/or OWA. I am constantly getting a credential pop for a shared mailbox i am automapped to. I've been on Wave 15 for over a month and this just started this morning so NO it's not the AutoMapping issue described here:
Description: Users that have been granted access to Exchange Online mailboxes other than their own via a feature called Auto-mapping—for example, they manage a resource mailbox for a conference room—may be unable to connect to these mailboxes after the service upgrade.