RE: 6.5 and 8.5.2. Compatibility Query .... Stan Rogers 21.Feb.12 12:53 PM Lotus Notes General All ReleasesAll Platforms
No, it won't cause any issues. It's the Designer client you use that determines which features are included in the databases (either on purpose or accidentally), so as long as your database design is using only features from 6.5.x, you'll be okay. You may want to keep an eye on the on-disk structure version, though, just in case you ever need to do a file-system swap between servers -- make sure the database is (and stays at) ODS 43 or below (check the "i" tab on the database properties).