I think they're wrong about that. The bug was in 6.0.2, so you would need to upgrade your server to 6.0.3 when it comes out. Once the new server is out, the old Outlook connector would work -- you would just have to download the GAL again. But generally, if a new server comes out, you should upgrade your Outlook connector as well.
As far as a GAL sync account, try:
GAL Sync Account - Zimbra :: Wiki