Free Windows tool No. 2: SyncToy
Microsoft's free SyncToy originated with the Windows XP PowerToy package and has been improved regularly. The latest version takes advantage of Sync Framework. To use SyncToy, pick two folders. Let's call one Left (for reasons manifest in the screenshot) and the other Right. Here's what you can do:
Synchronize: New files, and files changed since last sync, are copied between Left and Right folders. If a file has been renamed or deleted in one, it's renamed or deleted in the other.
Echo: New and changed files are copied left to right, with renamed/deleted files on the left renamed/deleted on the right.
Contribute: Same as Echo, but deletions on the left are not deleted on the right.
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