When you synchronize your offline files with their server-based copies, Windows performs the following operations for each offline file:

• If you have changed the file while offline and the server-based copy has not been changed, Windows updates the server copy with your changes.
• If you have not made changes to your offline copy but the server copy has been changed, Windows updates the copy in your cache.
• If either the offline copy or the server copy of a file is deleted, the file on the other computer is deleted as well, unless the file on the remote computer was changed while you were offline.
• If one copy has been deleted and the other copy has been changed, Sync Center displays a dialog box that allows you to delete the versions in both locations or copy the changed version to both locations.
• If a new file has been added on the server to a folder that you have marked for offline availability, that new file is copied to your cache.

If both the server copy and your offline copy have changed, Sync Center records a sync conflict. You will have the opportunity to resolve the conflict, but typically the only way you know a conflict exists is by observing a change to the Sync Center icon in the notification area. A yellow caution marker adorns the conflicted icon.

Click this icon to open Sync Center, and then click View Sync Conflicts. Sync Center will display the names of any files that have changed in both the server and cache locations.

Click the name of a file to resolve the conflict. You can keep either version or both, and the dialog box gives you some information about which file is newer and which is larger. If you know which one you want to keep, click it. If you want to inspect a version before deciding, right-click it and choose Open.