When you have a mail enabled  public folder in your exchange server 2007/2010 environment, you might face issues with email forwarding from the public folder from your user account, where you will get an error “Operation failed”.

Resolution :

1. Logon to outlook with administrator(Domain) credemtial
2. Goto the Public folder
3. Select the folder where you are facing the issue
4. Right click
5. Select Properties
6. Goto Permission TAB
7. Add users
8. Check mark the appropriate rights on the “Write” permission area..normally “Edit all” will do the work
9. Click apply and click ok.