Me too. This with the 4/3/08 creation date version of V5.3.2 running under OSX 10.5.2.
In Now Contact, clicked on File/Synchronize/With Address Book and immediately got a dialog box with an icon of an Exclamation Point on a Red Stop Sign saying "Address Book Sync could not run - Address Book Sync is not supported on Mac OS 10.5 or newer."
Tried a different contact file, but got the same result.
Trashed the com.nowsoftware.nowcontact.plist and com.poweronsoftware.nowcontact.plist files and got the same dialog box.
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