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What happens if Free / Busy Support isn't enabled and I try to use Free Busy with Outlook XP?
Answer
There are two known errors that may occur if you do not enable Free / Busy Support with Outlook XP or do not meet the minimum requirements. To solve either or both of these issues turn off the Outlook client's Free/Busy publishing by clicking Tools > Calendar Options > Free/Busy Options and uncheck the "Publish at my location" checkbox. Then exit and re-open Microsoft Outlook. Before proceeding with these instructions however you should review the two errors below and confirm that you are experiencing one of them, and not something else.
Error #1:
ERROR: "An unexpected error occurred: Not enough memory available to complete the operation. Close other programs to make more memory available; and then try again." This error may occur when Microsoft Outlook XP (2002) tries to send and receive free/busy data to a Free/Busy Server."
ERROR: Microsoft Outlook "An error occurred publishing your Internet free/busy data. Write operation failed at URL:" This error may occur when Microsoft Outlook XP (2002) tries to send and receive free/busy data to a Free/Busy Server."