If you are based in the UK and run Exchange 2010 UM it is likely that you will install and use the English (en-GB) Language Pack with your UM Dial Plan.
You may then notice that Voice Mail Previews are not being displayed in Outlook or OWA.
Be aware that Voicemail Preview is only available with the following UM Language Packs:
- English (US) (en-US)
- English (Canada) (en-CA)
- French (France) (fr-FR)
- Italian (it-IT)
- Polish (pl-PL)
- Portuguese (Portugal) (pt-PT)
- Spanish (Spain) (es-ES)