The official description for that dll is "Exchange support for Unified Messaging, e-mail permission rules, and calendar availability.
This allows you to read and reply to voice mail over the phone AFAIK. Re: "Microsoft Exchange Add-In" (UmOutlookAddin.dll) + Outlook Security Form. The antivirus status is valid in both cases. If we don't use the form, the options are still all grayed out but the first option is checked ("warn me. I noticed that when the security form is used, all the options in the programmatic access section are grayed out and no options are checked editing the registry makes no difference. We have installed Exchange 2010 servers and started to move mailboxes. I know we can migrate its individual settings to a GPO but that will take time.
The Outlook Security form is still in an Exchange 2003 public folder. If we disable that add-in in the Trust Center in Outlook 2010, no warnings appear.Īlso, does anyone know what exactly that add-in is needed for? It seems to be involved in calendar availability info as well as unified messaging so disabling it would be risky. However, in Outlook 2010, using the form causes the "Microsoft Exchange Add-In" (Mso.dll + UmOutlookAddin.dll) to be caught by the object model guard on start-up and composing messages ("a program is trying to access."). For many years, we've been using the Outlook Security Form with Outlook 2003 clients without any problems.
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