I faced one issue of all of user data loss for Guest account on Win7 Enterprise. This happened twice with me after i saved my data in guest account and rebooted my m/c. This even didn't send a single notification before doing such operation. I searched on Web and came to know about being this as a feature to delete all changes made by Guest after reboot. Note that this issue was not found on Win7 Ultimate. Is it really a feature considering a direct loss of user data??

Does it occur every time? Are all files and configurations erased?Arthur Xie - MSFT

Yeah, I tried it twice on one machine and it happened both the times. All the configuartion settings by Guest Account are lost.