Suddenly I can't sync the address book ("not installed" it says)

Oh, Blackberry. I've had you only a week and I already hate you.

Everything was going fine. I've been syncing my Outlook calendar and desktop with no problems until last night. That's when the Desktop Manager 6 said there was a BB software update. Fine, I did the update. Now my device's address book is empty save for one contact repeated 10 times and the Desktop Manager says the Address Book is not installed. I did a full restore and that had no impact on the device's address book, though it reversed everything else on my BB by about 24 hours.

Any ideas?

Well, after wasting a few precious Friday night hours, I fixed it by rolling back the OS from 5.0.0.9 to 5.0.0.6.

I'm having exactly the same problem with my BB Tour - only the address book. How do you roll it back to the old version?

I rolled it back using the Desktop Manager V6. Go to Device/Device Update/ and look for a button that says "View Other Versions." Then just choose the earlier version from the list.

After the device rolls back, which will take a while, I think you still have to check the box next to Address Books under "Organizer." If it's grayed out, click on "Configure Settings."

Hope this helps!

It worked! Thanks for saving me days more of frustration!

I have a 9550 Storm 2 with nothing but sync issues since 5.0.0.1015 and Desktop Manager 6.0. I have spent over 10 hours dealing with sync issues and chasing error 0x80043ac9 which has no clean answer on any forums. I think I am going to do a rollback as well. Thanks RIM for taking a page out of Microsoft's book on testing.

This worked for me also, woo hoo!!! I was getting very frustrated, i appreciate your help mrbber

I rollbacked also. it did not eliminate the address book not installed error for me. I loaded my gmail account and installed my contacts over the air. I now have my phone book back. BB has one unhappy customer here.

Dear Mrbber, THANK YOU THANK YOU THANK YOU. ive been sitting with this for 2 days now and finally im able to sync contacts onto by bb.
i still however am not syncing perfectly as "cannot connect to yahoo server" error msg comes up on my desktop manager everytime I sync (but im still able to access my yahoo acc perfectly). am i doing something wrong here?

I did this and it did not work. the address book is still not installed

cant post links yet but its KB23978

didn't work. anyone else?

After some playing around, I found that KB23978 as mentioned by DrWeir worked for me. I couldn't use an older backup, as that just messed up my contact list. I also first cleared my contact list completely on the Blackberry before I made the backup, and re-synced it with my outlook afterwards. Here is the link to the KB : KB23978-BlackBerry Desktop Software 6.0 displays address book or calendar as not installed within Organizer