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 | ||||||