| Code | Description | Version |
| FRI | An indicator that Friday is or is not preferred for the day on which the appointment will occur. OK = Preferred appointment day NO = Day is not preferred | added v2.3, removed after v2.3.1 |
| Fri | An indicator that Friday is or is not preferred for the day on which the appointment will occur. | added v2.4 |
| MON | An indicator that Monday is or is not preferred for the day on which the appointment will occur. OK = Preferred appointment day NO = Day is not preferred | added v2.3, removed after v2.3.1 |
| Mon | An indicator that Monday is or is not preferred for the day on which the appointment will occur. | added v2.4 |
| PREFEND | The preferred end time for the appointment request, service or resource. Any legal time specification in the format HHMM, using 24-hour clock notation | added v2.3, removed after v2.3.1 |
| PREFSTART | The preferred start time for the appointment request, service or resource. Any legal time specification in the format HHMM, using 24-hour clock notation | added v2.3, removed after v2.3.1 |
| Prefend | An indicator that there is a preferred end time for the appointment request, service or resource. | added v2.4 |
| Prefstart | An indicator that there is a preferred start time for the appointment request, service or resource. | added v2.4 |
| SAT | An indicator that Saturday is or is not preferred for the day on which the appointment will occur. OK = Preferred appointment day NO = Day is not preferred | added v2.3, removed after v2.3.1 |
| SUN | An indicator that Sunday is or is not preferred for the day on which the appointment will occur. OK = Preferred appointment day NO = Day is not preferred | added v2.3, removed after v2.3.1 |
| Sat | An indicator that Saturday is or is not preferred for the day on which the appointment will occur. | added v2.4 |
| Sun | An indicator that Sunday is or is not preferred for the day on which the appointment will occur. | added v2.4 |
| THU | An indicator that Thursday is or is not preferred for the day on which the appointment will occur. OK = Preferred appointment day NO = Day is not preferred | added v2.3, removed after v2.3.1 |
| TUE | An indicator that Tuesday is or is not preferred for the day on which the appointment will occur. OK = Preferred appointment day NO = Day is not preferred | added v2.3, removed after v2.3.1 |
| Thu | An indicator that Thursday is or is not preferred for the day on which the appointment will occur. | added v2.4 |
| Tue | An indicator that Tuesday is or is not preferred for the day on which the appointment will occur. | added v2.4 |
| WED | An indicator that Wednesday is or is not preferred for the day on which the appointment will occur. OK = Preferred appointment day NO = Day is not preferred | added v2.3, removed after v2.3.1 |
| Wed | An indicator that Wednesday is or is not preferred for the day on which the appointment will occur. | added v2.4 |