The Sync Issues and Local Failure folders are not visible by default. Solution 2: Clean Sync Issues and Local Failure Folders If it does not, follow the next solution. Turn off the antivirus protection and firewall temporarily to check if they are preventing Outlook from synchronizing the mailbox. Also, you may want to check your security software, such as antivirus or firewall settings, that may prevent Outlook from syncing the OST with Exchange Server. Unplug and plug the network cable or reconnect to WLAN and verify you can access the internet and the Exchange Server is online. Before you begin the advanced troubleshooting, check your network connection. Solution 1: Check Network ConnectionĪ poor or bad network connection can prevent Outlook from synchronizing mail items from the OST file to the mailbox on Exchange Server. If synchronization is not working, follow the solutions discussed below to troubleshoot the issue. If the number of items in the Server folder contains and the Offline folder contains fields are different, synchronization isn’t working correctly.Select the Synchronization tab and check Last Synchronized on timestamp, Server folder contains, and Offline folder contains statistics.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.

How do i find outlook 2016 sync issues