Client Patches are occasionally applied to the various clients for several reasons:

To fix some functionality issue (bug) in a client.
To update one or more art files, which are stored client-side.
To fix one or more client-side security holes.
To add the client-side functionality of new server-side content.
To synchronize the patch numbers of the various clients.

Up until the release of Third Dawn, all patches were, obviously, only for the 2D client. It was some time after this before the numbering for the client patches associated with the 2D and 3D clients were synchronized.

Patch numbers for the 2D and SA clients are not synchronized.

Current Clients

These game clients are currently supported and frequently updated. They may be used to connect to official Ultima Online game servers.

2D(Classic) Client Patches

Latest: 7.0.0.4 - September 23, 2009

See: List of 2D Client Patches

Stygian Abyss(Enhanced) Client Patches

Latest: 4.0.0.2 - September 8, 2009

See: List of SA Client Patches

Discontinued Clients

These game clients have been retired and may no longer be used to connect to official Ultima Online game servers.

Kingdom Reborn Client Patches

Final: 2.59.0.2 - July 14, 2009

See: List of Kingdom Reborn Client Patches

Third Dawn Client Patches

Final: 5.0.9.1 - March 28, 2007

See: List of Third Dawn Client Patches