The "UTC/Monrovia" time zone issue is caused when an EAS client (iOS, Android, Windows Phone) creates or modifies an Exchange meeting. There is some time zone information getting lost on the Exchange server. We have tested
a fix on the Exchange server and hope to roll it out soon when testing completes.
If you are seeing a meeting shift that does NOT involve "UTC/Monrovia," please install the 15.10 update that just came out yesterday. There is an issue with autoupdate, so it will not automatically be downloaded.
You can download the update directly from here: https://support.microsoft.com/en-us/kb/3048682/
Note: we have received differing reports regarding the behavior of existing shifted meetings after incorporation of the fix. Some users have reported that installing the update was enough to fix the
shifted meetings. Others have had to re-accept the shifted meetings. If neither of those options works, then the meeting organizer will have to resend the meeting invite by opening it from the calendar and clicking "Send Update." In short, the fix should
prevent any new meetings from getting into this state, but the impact on existing shifted meetings may vary.