We are running Outlook 2010 on XP and Exchange 2003. Apparently, direct booking is disbled by default in Outlook 2010 and there is a registry fix to enable it. However, it only seems to work propperly when booking resources using one's own calendar.
If trying to book a resource on someone elses calendar (shared, delegated, even someone the user has full mailbox and send as rights for) without inviting anyone , the resource gets booked succesfully, but immediately after the resource confirmation pop-up an error message comes up that the operation did not complete successfully, the appointment does not get saved in the organizer's calendar and the appointment window remains open. if the user tries to close the appoinment window they get prompted to "save and send", "save without sending" or "don't save". If they choose "svae and send" they get the same error message. Only if they choose to "save without sending", then the appointment gets saved in the organizer's calendar.
The booking works fine without this error if the user adds any recipient as required/optional, but if trying to book the resource without inviting anyone else, then they get the error. Also, if booking from Outlook 2003, there is no error. I noticed that when you go to scheduling and add more recipients from address book, in 2003 the organizer shows in the required field but in Outlook 2010 the required filed is blank. If the user tries adding the organizer manually, then the organizer gets a meeting invitation, which is not what they want. If the user adds the resource to the required field, as well as the resource field, then direct booking does not work att all - the appointment gets saved in the organizer's calenda, but the resource does not get booked.
Can anyone help?
Event Type: Information
Event Source: Microsoft Office 14 Alerts
Event Category: None
Event ID: 300
The operation failed. The messaging interfaces have returned an unknown error. If the problem persists, restart Outlook.