

All the changes are made directly on the mailbox server, and thus, changes are updated in real-time. 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).
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