For more information see this thread
Figure 3.1. Software version compatibility matrix
OpenACS Version | 3.2.5 | 4.5 | 4.6 | 4.6.1 | 4.6.2 | 4.6.3 | |
AolServer | 3 | Verified | |||||
3.3+ad13 | Verified | ||||||
3.3oacs1 | Verified | ||||||
3.4.2oacs1 | Verified | ||||||
3.5.5 | Verified | ||||||
4 | No | ||||||
PostGreSQL | 7.0 | Verified | |||||
7.2.x | Verified | ||||||
7.3.2 | No | Untested | |||||
Oracle | 8.1.6 | Verified | |||||
8.1.7 | Verified | ||||||
9i | No |