Recently I was deploying managed solution into a new environment. Deployment done successfully without errors. But I notice an issue with managed solution deployment in CRM2011.
With Managed solution import, All the OOB entities having wrong tab order. Then i came to know Managed solutions merge changes to the existing customizations file instead of replacing.
Microsoft has to resolve this issue.
Workaround: Manually editing the customizations.xml of managed solution & reordering the tab sequence. Then importing managed solution to the host system. Now it will get the correct tab order.
It's not a good idea, but hope it helps!!!