Users can't access their archive mailbox in Outlook
Original KB number: 3098940
Consider the following scenario:
- The MAPI/HTTP protocol is disabled in an Exchange Server 2016 or Exchange Server 2013 organization.
- The MAPI/HTTP protocol is enabled at the mailbox level for one or more users.
In this scenario, users who have MAPI/HTTP enabled can't access their archive mailbox in Outlook.
The issue may occur even after the MAPI/HTTP protocol is enabled for the organization.
This issue occurs because Exchange Server returns RPC/HTTP information for a MAPI/HTTP autodiscover request when the MAPI/HTTP protocol is disabled in the Exchange organization.
Workaround - Method 1
Use Microsoft Outlook Web App or Microsoft Outlook on the web instead of using Outlook.
Workaround - Method 2
Disable the MAPI/HTTP protocol for the affected users by running the Set-CASMailbox cmdlet as follows:
Set-CASMailbox <Alias> -MapiHttpEnabled $False
Workaround - Method 3
Enable the MAPI/HTTP protocol for the organization by running the Set-OrganizationConfig cmdlet as follows:
Set-OrganizationConfig -MapiHttpEnabled $True