Yes, there will be a 7th season. NBC officially renewed it for a 7th season a few days ago. Also, considering the fact that The Office has high ratings in the key 18-49 demo and it's one of NBC's few bright spots, I expect it to last about 8 atau 9 seasons. It's still a very good tampil and there's many unresolved story lines and plots. Not to mention future story lines that have yet to be developed.
I think there is going to be a 7th season. There is still so much that needs to be seen. Like Erin and Andy, I want to see them totally together, and I heard that holly is supposed to be coming back aswell.