When upgrading our SEE management servers from 7.0.4 and 7.0.5 I noticed the entire 'Symantec' registry key and subkeys was deleted. This is OK if you're just running SEEms on the server but will break anything else such as SEPM and you'll only notice when you reboot and it doesnt start.

As a precaution, backup the key! Of course standard procedures suggest this would be done on test servers first :)