Error -16999 (3rd) / null error

  • Operating System(s): MacOS
  • Operating System Version(s): 7.0.1, 7.1, 7.5, 7.5.1, 7.5.2, 7.5.3, 7.5.5, 7.6, 7.6.1, 8.0, 8.1, 8.1.1, 8.5, 8.5.1, 8.6, 9.0
  • Application: Microsoft Outlook Express
  • Application Version(s): 5.0

Error: -16999 can be ignored.

Error Message

Error: -16999
Cause

This error may occur when there is no new e-mail on the server.
Solution

This error can be ignored. This information is referenced from Microsoft Knowledge Base article Q244334.