Problem:

If security center service is missing or damaged, or antivirus software is not installed and current, Outlook 2010 will not allow sync with other apps without prompt.  Eg. Commit.

Solution:

You could try adding the following key to the registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\14.0\Outlook\Security

In this key add the following value:
ObjectModelGuard, DWORD =2

The values 0, 1 and 2 correspond to the options in the Programmatic Access Security settings in the Trust Center.
0 = Warn if Anti-Virus is out of date (recommended)
1 = Always warn
2 = Never warn