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However once I joined this computer back to the domain and let it sit for a few days it was also working fine. Once the client started using Outlook again after some time has passed the issue had come back. I ran the PSTscan tool to check for anomalies on the OST file (which it found and repaired but the issue still occurs).
The client has a computer off the domain at home that his work email is tied to and he has never had any Outlook OST vs PST repair of these issues in Cache mode with that device. After performing these steps, Outlook’s all folders will be synced to the server. If this method doesn’t work for you, navigate to other solutions. Select the button below to launch a diagnostic in the Microsoft 365 admin center.
Here is the strange part I tried to remove the computer from the domain and have Outlook run from a local account for a few days.If there’s a feature you think is missing from the Mail and Calendar apps, or if a feature in isn’t working properly, you can provide feedback directly to the Mail and Calendar team.Check with your email provider for instructions about how to create an app password for your email account.However, his OST file is not anywhere near that size it’s about 5GB.I regret that you are experiencing issues with your Microsoft Outlook slow synchronizing inbox message, and need help speeding up.Now, we will verify the server settings to fix the Outlook synchronization error.
How to Fix Sync Issues in Outlook or OWA? – A Complete Guide
Moreover, it maintains the folder hierarchy and metaproperties of the data when processing Outlook data files. This tool also helps users fix Outlook syncing issues by repairing OST or PST files and syncing the data smoothly. Third-party firewalls or antivirus software might prevent you from syncing your email and calendar events.
Professional automation to resolve Microsoft Outlook syncing issues
If there’s a feature you think is missing from the Mail and Calendar apps, or if a feature in isn’t working properly, you can 
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