Mac OS X 10.8.1 update is recommended for all users running Mac OS X 10.8 Mountain Lion.
It includes general operating system fixes that smooth out some bugs and also seems to fix a common issue where battery life was not displaying correctly for some users. Specifically, it:
Resolves an issue that may cause Migration Assistant to unexpectedly quit
Improves compatibility when connecting to a Microsoft Exchange server in Mail
Addresses an issue playing audio through a Thunderbolt display
Resolves an issue that could prevent iMessages from being sent
Addresses an issue that could cause the system to become unresponsive when using Pinyin input
Resolves an issue when connecting to SMB servers with long names
Addresses a issue that may prevent Safari from launching when using a Proxy Automatic Configuration (PAC) file
Improves 802.1X authentication with Active Directory credentials.
Full details on the update can be found here and information on the security content of this update can be found here.
Download OS X 10.8.1 Update in Softonic