Here is download link Sony Ericsson Xperia™ X8 PC Companion for Windows and Mac OS X. Please download the installation package to a temporary folder on your PC. Then run the downloaded file, and follow the instructions that appear.
Download link :PC Companion for Xperia X8
If download doesn’t processing in few second please follow the official website. Follow the webpage : http://www.sonymobile.com/global-en/software/. Then choose your device type and model on the search box on the right page and follow the instruction that appears
Are you Macintosh Apple user,Please to download your software Sony Ericsson bridge to Mac OS X. Click here : iSync Soner to MAC OS X.
Another software that can use to sync your xperia x8 to pc and mac os ":
Media Go for PC Windows Download Media Go
Media Sync for Mac OS Download Media Sync