ActiveSync is an effective program, that lets you to synchronize Outlook items. This program synchronizes Outlook data in one condition. And, condition is that Outlook PST file must be in a corruption free state. If by mistake, you are trying to synchronize data of corrupt Outlook PST file, you will fail to synchronize Outlook data. Proper synchronization cannot be done due to other technical reasons as well. You can address the non-synchronization issues with appropriate measures. You have another choice of a third party PST Repair software, if corruption is the issue.

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