Klaus1, these were my settings prior to your last post
defaults read com.apple.Safari WebKitHistoryItemLimit
99999999
defaults read com.apple.Safari HistoryAgeInDaysLimit
365000
defaults read com.apple.Safari WebKitHistoryAgeInDaysLimit
2012-10-12 15:17:45.530 defaults[97624:707]
The domain/default pair of (/Users/me/Library/Preferences/com.apple.Safari, WebKitHistoryAgeInDaysLimit) does not exist
The HistoryAgeInDaysLimit key comes AFAIR from http://secrets.blacktree.com/edit?id=4964
Although I added the following key as per your post and linked article, Safari keeps its limit to 100000 items
defaults write com.apple.Safari WebKitHistoryAgeInDaysLimit 365000
defaults read com.apple.Safari WebKitHistoryAgeInDaysLimit
365000
Now, I have two questions
1. How can I know if Safari’s actually processing the value of the key?
2. Which values did contributor LeonieDF set for both keys?