1. Troubleshooting e-mail  flow

• Troubleshooting message delivery.
• Specifying why Exchange Online inappropriately redirects messages.
• Identifying misconfigured e-mail records in DNS.
• Troubleshooting SMTP e-mail delivery.

1. Troubleshooting message filtering in mailboxes and Microsoft Defender for Office 365

• Diagnosing problems caused by misconfigured or damaged mailbox rules.
• Trouble with appendices to message.
• Analysing actions performed by Exchange Online Protection.
• Identifying misconfigured spam filtering policies.

1. Troubleshooting compatibility and storage

• Specifying why eDiscovery does not yield intended elements.
• Diagnosing which local firewalls  and eDiscovery are used for specific element.
• Deleting and clearing elements in whole  Exchange Online organisation.
• Specifying why elements are not stored according with their purpose.
• Troubleshooting message records management.

1. Troubleshooting ciphering, inspection and journaling

• Verifying reasons for lack of ciphering or deciphering messages according with their purpose.
• Secure audit log.
• Diagnosing reasons for lack of elements in Exchange Online journal.

1. Troubleshooting Outlook desktop clients

• Verifying  Outlook Clients’ connection with Exchange Online.
• Diagnosing problems with  Outlook Client authentication.
• Troubleshooting calendars, resource reservation and delegation.

1. Troubleshooting mobile devices

• Solving problems with mobile devices during connection with Exchange Online.
• Diagnosing problems with urządzeniami ActiveSync devices.

1. Troubleshooting Exchange Online configuration

• Diagnosing problems appearing while sharing recipients and other objects.
• Solving problems which influence mailboxes, distribution lists and other recipients.
• Verifying membership in address lists.
• Fixing typical problems which influence the whole organisation.
• Verifying access to public folders.

1. Troubleshooting hybrid environment and migration

• Configuring appropriate e-mail flow between Exchange Online and Exchnage Server recipients.
• Troubleshooting available/busy information, public folders and recipients synchronisation in hybrid deployments.
• Solving problems during migration.