

However, Sync Issues and its subfolders are not visible by default. The Sync Issues folder contains the synchronization logs that can help you troubleshoot the synchronization issues between Outlook and Outlook Web App (OWA). Also, check your firewall settings to prevent Outlook clients from connecting to the server and synchronizing the OST file with the mailbox server. Reconnect the Ethernet cable or Wi-Fi and verify Exchange Server is online and you can access the internet. Solution 1: Check Network ConnectionĪn unreliable or poor network connection can prevent Outlook clients from synchronizing the OST file to the mailbox on Exchange or Microsoft 365 Server. Solutions to Fix Outlook and OWA Synchronization Issuesįollow these solutions to troubleshoot and fix synchronization issues between the Outlook client and OWA.

On the other hand, Outlook Web App or OWA runs on a compatible web browser, such as Google Chrome, and connects to the mailbox server directly. The changes made in the Outlook client are first stored in the OST file and then synched with the Exchange or mailbox server based on the Outlook settings. Offline Storage Table or OST (also known as Offline Folder) allows users to access their Outlook account and mail items even when the system is offline.

Outlook for Windows creates an Outlook data file, such as OST, to store a copy of mailbox items on the local machine. Outlook client and Outlook Web App (OWA) are two different modes to access Exchange or Microsoft 365 email accounts. Solutions to Fix Outlook and OWA Synchronization Issues.Symptoms of Synchronization issues Between Outlook and OWA.Reasons for Synchronization Issues between Outlook and Outlook Web App (OWA).
