Upgrading Exchange 2007 to sp2 will be necessary for all exchange admins that want to migrate (transform) to Exchange 2010. This service pack is not for the faint hearted because it does about a complete reinstall of your exchange server. First thing we have to upgrade our AD. Yes a new ForestPrep. This is well documented so I won’t go in to that here.
What about unified communication role? No problem if you don’t have language packs installed. If you do you need to de-install them first. Upgrade to SP2 and then install the SP2 language pack.
What about your language settings? Do you lose them? No, once you install the SP2 language pack your auto attended will continue work as before.
De-install command : Setup.com /RemoveUmLanguagePack:<UmLanguagePackName>
Install command : Setup.com /AddUmLanguagePack:<UmLanguagePackName> /s: d:\<MyLocalFolder>
Setup.com is from the exchange installation files.
MyLocalFolder is folder that contains the language files.