The Exchange Server 2010 SP1 Unified Messaging (UM) Language Packs can be downloaded here. The version is 14.01.0218.015, dated 08/24/2010. Note that earlier this link referred to SP1 Beta material, as mentioned in this post.

Unified Messaging (UM) language packs allow an Exchange Server 2010 Service Pack 1 (SP1) UM server to speak additional languages to callers and recognize other languages when callers use ASR or when voice messages are transcribed.

The UM language packs contain, per language:

• Pre-recorded prompts;
• Grammar files that are used by a UM server to lookup the names of given users in the directory;
• Text to Speech (TTS) translation so that content (e-mail, calendar, contact information, etc.) can be read to callers;
• Support for Automatic Speech Recognition (ASR), which allows callers to interact with UM using the voice user interface (VUI);
• Support for Voice Mail Preview which allows users to read the transcript of voice mail messages in a specific language from within a supported e-mail client such as Outlook or Outlook Web Access.