http://community.bistudio.com/wiki/Arma_2:_Patch_v1.05Version 1.05 Highlights
* Free bonus campaign Eagle Wing
* Free bonus helicopter addon AH-64D
* New Warfare multiplayer mode When Diplomacy Fails, including 3-sides and support for diplomacy between factions
* Major AI tweaking and balancing (better combat cooperation, better situational awareness, new Suppressive fire command)
* Significant performance improvements, especially in large towns
* Fixed compatibility problems under Windows Vista and Windows 7 x64 with 8 GB and more RAM
* Grass now provides concealment also in distance
* Improved hit detection and damage system
* Improved object visibility and less significant objects popping in distance
* Spatial sound improvements
* Automatic launching of user made addons (units, missions etc.) via "pbo" file association with the game
* Possibility to switch between windowed and fullscreen mode at any time in game menus using Alt + Enter or through video options
* Various crash opportunities fixed
* Linux server support added (dedicated server file available as separate download)
* New GUI to various dedicated server settings
* DRM free for users of legitimate installs
* Optional BattlEye anti-cheat protection
* Airplane Heads-Up displays reworked
[edit]
Update 1.05 incorporates all fixes included in previous patches, most notable are:
* Improved multiplayer and cooperative campaign (saving games, connection issues)
* Numerous fixes and improvements in the Harvest Red campaign
* Mission editor improvements
* Many new scripting functions
* Improved AI driving skills
* Improved Micro AI tactics, attack in pairs, path limiting to avoid passing through walls.
* Fixed multiplayer session NAT negotiation
* Multiple save slots supported
* Improved terrain shape beyond map borders
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