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This article describes the Microsoft Outlook Error code 0x800CCC91 in windows 10/11. It is Microsoft Outlook Error. This outlook Error 0x800CCC91 restricts your ability to send/receive emails on your Outlook email address successfully. This error is quite common and is faced by many Microsoft Outlook users.

Causes of Outlook Error Code 0x800CCC91 in windows 10

Incorrect Outlook Configuration setting

PST files get corrupt

PST file crosses its fixed file size limit

Failure of POP3 and Protocol STMP in the database server connection

Improper synchronization between Outlook and the server

Usage of invalid password or username

Virus Infection