Old conversations are not synchronized with new MacBook Pro

Question

Hello!
Yesterday I purchased the newest Retina MacBook Pro (medio 2014), upgraded to Yosemite and started installing and setting up my applications. Sadly, I seem to have a problem with iMessage, since it's not synchronizing my messages properly.
Up until now I've been using an iPhone 3GS, a MBP (medio 2009 w. Yosemite) and an iMac (late 2012 w. Yosemite), and everything seems to work fine, since all the devices share and can access the same conversation history. However, when I started setting up iMessage on my newly purchased RMBP, the conversation history with each of my contacts isn't synchronized even though I'm able to send messages. I tried logging in/out, delete/add my iCloud account, but nothing seems to work.
I assume all of my messages are synchronized with iCloud. Of course it would make sense if it took some time for Apple to recognize and synchronize the messages, but it's been 18 hours since I started messing with iMessage. Am I being to impatient?
Does anybody know how to solve this problem?
Thanks in advance.
Best regards,
Theis

Answer 1

Hi,
It is a yes, no and maybe answer.
You have to grab several items form the old Mac and place them in the correct places on the new Mac.
As you seem to be using Yosemite all round that task is easier (that is a relative easier),
See this pic
Note the Path Bar across the bottom that list where this Archive folder is.
It can be shortened to ~/Library/Containers/com.apple.iChat/Data/Library/Archive
(you can type or Paste this in the Dialogue box in the Finder > Go Menu > Go to Folder)
In the Messages folder is also an Alias that links to the Attachments folder.  (I will come to that later)
You also need this spot.
This is Still in ~/Library but not in the Containers bit but just the Messages folder.
It has the Attachments folder and the various chat.db items.
Move the Contents of the Attachments from one computer to the new one.
Move ALL the chat.db items (I must admit I am not sure about leaving the incompatible ones behind).
Make an Alias of the Attachments folder and drag it to it's proper position (in the Containers/../../Library/Messages folder)  (replace the one that is there so it is linked to the moved stuff).
Now go back to the Archive folder.  If you are using the Show Path Bar (view Menu of Finder) then you can Right Click the folder icons
Select the Archive Folder and then Get Info on the right click.
At the Bottom highlight your name in the list for Permissions.
You Should have Read and Write Permissions.
If you now use the Gogwheel type icon you can see if you Own the Folder.
If it is greyed out like this one then you Own it.
However you are most likely to have to "Apply to Enclosed" items as you have just moved things.
Repeat for the Chat.db and Attachments (~/Library/Messages folder).
And then the Alias just to be sure.
There is not an Export option that would be simpler.
9:12 pm      Wednesday; November 5, 2014
​  iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad