08-03-2009 03:28 AM
This is not a function available in ACT!.
If using ACT! 5/6, this is a feature available with MergeMaster!
08-03-2009 05:48 PM
It's been around since ACT! 5 with a lot of users, so I guess you can trust it.
It won't interfere with any other software
No, it's not free.