The June 13 2017 Outlook Security Update is causing all kinds of issues for users. Attachments won’t open, iCloud doesn’t work, custom forms don’t work.

Microsoft is investigating. As of June 21 2017, we have a registry key to fix the iCloud issues. To correct other issues, you will need to uninstall the update

Is it dangerous to uninstall it? There is a risk, but for many people, the risk is very low. The exploit, like most, if not all Office exploits these past few years, will not run automatically – the user needs to be convinced to open the document and possibly, change security settings.

"Uninstall Updates in Office 'Click to Run'"
Uninstall the update in Outlook 2007 / 2010

While all four versions of Outlook are affected by the bugs, Outlook 2007 and Outlook 2010 seem to have the most issues with this update.

Attachments won’t open

This issue was fixed in the July 27 2017 update.
Description of the security update for Outlook 2016: July 27, 2017
Description of the security update for Outlook 2013: July 27, 2017
Description of the security update for Outlook 2010: July 27, 2017
Description of the security update for Outlook 2007: July 27, 2017
Outlook known issues in the June 2017 security updates

The security update is targeting “specially crafted office documents” and part of the “specially crafted” applies to file names. Multiple dots and certain characters (including ?*<>|!) in a file name will trigger the Open or Save dialog, or in the case of attachments on Contacts, Tasks, Appointments, or in RTF formatted messages, a silly dialog stating that Outlook isn’t installed.

The program used to create this object is Outlook. The program is not installed on your computer. To edit this object, you must install a program that can open the object.

When you open an attachment, you may get the "open or save" dialog when you didn't previously. After saving the attachment to your hard drive, it should open without issue. If you prefer dragging the attachment to File Explorer, that should work too.

There is one (previously) known issue: if a message whose subject ends with a file extension that is on the unsafe extension list, the message will be blocked as an unsafe file type. You need to save the message to the hard drive and rename it, then attach.

iCloud doesn’t work

The solution for this problem is at

How to fix the iCloud APLZOD.dll error in Outlook

A user complained:

iCloud had been working perfectly for years syncing with Outlook until yesterday. When I started getting this message: The set of folders cannot be opened. An unexpected error has occurred. MAPI was unable to load the information service C:\PROGRA~2\COMMON~1\Apple\INTERN~1\APLZOD.dll. Be sure the service is correctly installed and configured.

The usual fixes of signing out of iCloud and signing back in or reinstalling iCloud won’t fix this problem.

Add one of the following registry keys to allow iCloud to load.

Consumers and others not using group polices will use this key:

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security\
DWORD: AllowUnregisteredMapiServices 
Value: 1 (disable the security checks)

The group policy key is at

HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Outlook\Security\
DWORD: AllowUnregisteredMapiServices
Value: 1 (disable the new security checks)

You will need to restart Outlook for the key to take affect.

Ready-to-use registry files are available:
AllowUnregisteredMapiServices
Policy key: AllowUnregisteredMapiServices

Custom Forms won’t open

Users are complaining about published custom forms too. VBScript and some controls are blocked.

The solution for this problem is at

Custom Form Security Changes

I have a custom form that's published to my personal forms library that I use for new contacts. When I create a contact, I get the following message and the VBScript behind the form doesn’t run. If I uninstall the security update the problem goes away.
"To help prevent malicious code from running, one or more objects in this form were not loaded. For more information, contact your administrator."

As with the other problems, the short-term solution is to uninstall the security update.

BCM Crashes Outlook

I haven’t discovered any issues between the security update and BCM, however, an old issue with the Microsoft Chart controls is popping up again, most likely due to .NET framework updates.

When the chart controls are missing or corrupted, the BCM dashboards won’t display and Outlook may crash. Reinstalling the chart controls will fix it.

Get the file at Microsoft Chart Controls for Microsoft .NET Framework 3.5

June 2017 Non-Security Office Updates

The KB articles related to the non-security updates released in June 2017 for Office 2013 and Office 2016 applications and available through the Download Center and Microsoft Update are available in the following article at Microsoft TechNet.
June 2017 Non-Security Office Update Release

These downloads are for organizations with "MSI" installations; these updates are installed automatically in Office 2675 subscription software.