How to Determine OST Files are Synchronized with Exchange Server Check, the synchronization status in Outlook and Server by following steps The difference in number of items in Exchange Server and Offline folder will detect the synchronization issue. To ensure that the problem is with synchronization first determine the OST folder (Offline folder) are synchronized or not. So, to avoid such errors here are some steps to troubleshoot Exchange Server Mailbox synchronization problem with Outlook files OST and PST.

The server files are not available in OST or PST file and users can’t access them. Problems encounter during Outlook synchronization causes error and effect the working process. Synchronization between Outlook data file and Exchange Server is essential as it updates the files and makes them available to users.