- You upgrade to Microsoft Exchange Server 2013 Cumulative Update 1 (CU1).
- Exchange Server 2013 has the Unified Messaging (UM) language pack installed in addition to English (US).
- The UM language pack is the RTM version.
- UM Auto Attendant is speech enabled and is configured to use a language pack that is not English (US).
After you install the add-in, you may have to wait 24 hours the grammar file to be generated.