Right-click a mail folder, such as Inbox, and select Properties. To check if the synchronization is enabled and working, follow these steps: However, before following the solutions, check and confirm if offline folders are being synchronized or not. Solutions to Fix Synchronization Issues between OST and Exchange Serverįollowing are some solutions that can help fix the synchronization issues between OST and Exchange Server. There could be several reasons that can prevent Outlook from synchronizing the local cache, i.e., OST with the mailbox on the Exchange Server, such as: 
Reasons for Synchronization Issues between OST and Exchange Server This can drastically increase the local cache or OST file size, leading to integrity issues and damage the OST file due to oversizing.
However, Outlook continues to create new copies of the failed mail items it needs to synchronize with the Exchange Server.
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