Here are a few simple steps to upgrade your UM server to SP
Remove any language pack other than en:US
To find out which ones you have installed, open Exchange Management Shelltype in get:umserver to see what languages you have installed
Then from the source DVD or sources directory run in command prompt
i.e. in my case:c:\sources\exchange%22010\setup.com /removeumlanguagepack:en-gb
Then download and install the following (search for the latest version)
Microsoft Speech Platform Runtime
Microsoft UC MA Runtime x64
Now run the SP1 update!
Afterwards run the UM Language Update (in my case) en:GB
