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Reorganization
The old two tab guild window has been reorganized with a drop down menu containing four separate categories. The old format of player location and guild rank have been placed into each of their respective drop down items: Player Status and Guild Status; both of which remain largely unchanged.
Though this new dropdown approach is not quite as fast as tabbing between the two panels in the old guild window, it's a necessary evil as a couple new features have been added to the guild window that allow for more information at a glance.
If you're looking for the old "show offline" option, it's moved to the bottom of the frame, and works with each of the four tabs.
Achievements
One of the two new tabs in the guild window is the achievements tab, which lists each player's total achievement points and their rank in the guild. Every wonder who plays the game way too much? You can probably find out in this tab!
Any Jewelcrafters Online???
Without a doubt the most useful tab in the new guild window is the tradeskill tab, a tool that has largely flown under the radar with the release of 4.0.1.
The new tab allows you to view not only a list of all guild members and their tradeskills, but clicking on a player will bring up that player's tradeskill window complete with all recipes that player knows.
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Guild Information
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The guild message of the day and guild information box (where ventrillo or teamspeak information is often stored) now reside here alongside a dedicated box for guild events set up through the calendar. This will allow players in guild that use the in game event calendar to see a quick list of upcoming events without clicking through all the dates in the calendar, giving a handy birds-eye view of upcoming activities.