This section lists the Schedule+ error codes and their meanings.
| Error Code | Description |
| 0x80040820 | A problem occurred while accessing the disk. |
| 0x80040824 | The specified directory name is not valid. |
| 0x80040826 | The specified network path is not valid. |
| 0x80040828 | The filename is too long. |
| 0x8004082A | The session was cancelled. |
| 0x8004082F | A problem occurred while writing to the disk. |
| 0x80040831 | The drive cannot find the sector requested. |
| 0x80040832 | Too many files opened for sharing. |
| 0x80040834 | Insert a disk into the disk drive |
| 0x80040837 | A problem occurred while connecting to the network. See your administrator. |
| 0x80040843 | Invalid access code. |
| 0x80040844 | Invalid data. |
| 0x80040845 | Invalid drive. |
| 0x80040847 | Not same device. |
| 0x80040849 | Bad disk unit. |
| 0x8004084A | Invalid disk command. |
| 0x8004084B | Data error (cyclic redundancy check). |
| 0x8004084D | A duplicate name exists on the network. |
| 0x8004084F | Network request not supported. |
| 0x80040850 | Network busy. |
| 0x80040851 | Cannot make directory entry. |
| 0x80040853 | Invalid password. |
| 0x80040864 | Logon failure: account logon time restriction violation. |
| 0x80040867 | Already logged on. |
| 0x80040869 | Not logged on. |
| 0x8004086C | The specified user does not exist. |
| 0x8004086D | There are currently no logon servers available to service the logon request. |
| 0x80040871 | The user's account has expired or the password for the account has expired. |
| 0x80040872 | No account balance or no credit in user account. |
| 0x80040876 | Unauthorized login station. |
| 0x80040877 | Not enough quota is available to process this command. |
| 0x800408E0 | The file could not be accessed. |
| 0x800408E5 | The file version is not supported. |
| 0x800408E6 | The file version is not supported. |
| 0x800408EB | The schedule file has been damaged. See your administrator. |
| 0x800408EC | The file is locked by a process or another user. |
| 0x80040900 | The user information is not valid and could not be processed. |
| 0x80040907 | No server schedule is available. |
| 0x800409A7 | To create recurring appointments, you must clear the Disallow Recurring Appointments field. |
| 0x800409A8 | To create or modify recurring unbounded appointments, you must clear the Disallow Overlapping Appointments fields. |
| 0x80040A80 | End of table. |
| 0x80040A82 | The transaction could not be completed. |
| 0x80040A84 | The Undo action could not be completed. |
| 0x80040A87 | File locking is not enabled. You must install SHARE.EXE. |
| 0x80040A89 | The network could not be accessed. See your administrator. |