Article ID: 2872696 - View products that this article applies to.
Consider the following scenario:
The issue occurs because the CU1 version of Exchange 2013 Unified Messaging cannot generate a grammar file by using the RTM version of the language pack. Therefore, all Unified Messaging operations that rely on a grammar file will fail.
To resolve this issue, install the Exchange Server 2013 CU1 UM Language Pack add-in.
Download Exchange Server 2013 CU1 UM Language Packs
After you install the add-in, you may have to wait 24 hours the grammar file to be generated.