HI,
In the Message Menu > Preferences > Accounts I have several non iMessages Accounts (As well as the iMessages Account) listed
The two red indicated items show an @me.com (actually my iCloud ID) and an older @mac.com name Logged in to AIM (They are both Enabled)
The Blue bit indicates the + button where to Add Accounts (non iMessages ones)
In the General Section of the Preferences the Linked Buddy List (~Bee's CMD + 1 instruction) can be Unlinked
That will then change the Window Menu and the CMD + # items
This in turn can take up a lot of Screen Space
AS you can see the Buddy Lists show some people with the Green Video icon
This will start Video with that person "Natively" in the iChat style with the Messages app and without leaving it.
In My previous Post I said it this way
AIM and Jabber Accounts will be able to display Buddy Lists (See Window Menu)
By Default they are displayed as one (See General Section of Preferences to Unlink)
Buddy List work the same way iChat ones did and you can Video there with the same iChat Theatre and Screen Sharing functions (And Multiway Audio and Video chats).
I hope this clears things up for you.
8:01 PM Thursday; September 6, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Lion 10.7.2)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images." No, Seriously