Exchange Online and Outlook troubleshooting information
When running into issues related to Outlook or Exchange Online, you have the option to solve a lot of these issues yourself by using the information in the links shown below:
Source: Self-help diagnostics for issues in Exchange Online and Outlook
Contains diagnostics for e.g. :
Diagnostic | Description | Shortcut Link | Support article |
---|---|---|---|
Migration Exchange Web Services (EWS) throttling policy | Verify that the EWS throttling policy isn't too restrictive for a mailbox data migration that uses third-party tools. (Doesn't apply to Microsoft tools for Hybrid, IMAP, G Suite, or Public Folder migrations.) | Run Tests: EWS Throttling | |
Mailbox or message size | Check the size of a mailbox or the size of messages (including attachments). | Run Tests: Mailbox Size | Increase or customize Exchange Online mailbox size |
Deleted mailbox diagnostics | Check the state of recently deleted mailboxes. | Run Tests: Deleted Mailbox | Delete or restore user mailboxes in Exchange Online |
Exchange Remote PowerShell throttling policy | Update the Exchange Remote PowerShell throttling policy for the tenant. | Run Tests: PowerShell Throttling | |
Email delivery troubleshooter | Check whether email messages are successfully delivered. | Run Tests: Email Delivery | Find and fix email delivery issues |
Outlook user connectivity diagnostics | Diagnose Outlook connectivity issues for users by running several checks on possible service-side settings (root causes) so that a tenant admin can quickly fix the issues without involving the users. | Run Tests: Outlook User Connectivity | Fix Outlook connectivity issue |
Non-delivery report (NDR) diagnostics | Provide additional information about NDRs that are received through email messages. | Run Tests: Email NDR | Email non-delivery reports in Exchange Online |
Archive mailbox diagnostics | Check and identify issues about mailbox archiving. | Run Tests: Archive Mailbox | Enable archive mailboxes in the Microsoft 365 compliance center |
Outlook user password prompt diagnostics | Diagnose Outlook password prompt issues for users by running several checks on possible service-side settings (root causes) so that a tenant admin can quickly fix the issues without involving the users. | Run Tests: Outlook Password Prompt | Fix Outlook password prompt issue |
Retention policy diagnostics | Check retention policy settings. | Run Tests: Retention Policy | Retention tags and retention policies in Exchange Online |
Enable Basic authentication in Exchange Online | Enable Basic authentication for legacy protocols in Exchange Online if previously disabled by Microsoft, or opt out of the disabling process if there is a need to use Basic authentication with specific legacy protocols. | Run Tests: Basic Auth in EXO | Basic Authentication and Exchange Online – June 2021 Update |
DomainKeys Identified Mail (DKIM) diagnostics | Validate that DKIM signing is configured correctly and the correct DNS entries have been published. | Run Tests: DKIM | Use DKIM to validate outbound email sent from your custom domain |
Microsoft network connectivity information
Top 10 Tips for Optimizing & Troubleshooting your Office 365 Network Connectivity