i have the same problem as stated by aeyrib, and i would like to summarize:
1.- I have an office 365 home premium subscription, which expires/renews itself automatically on 06.03.2014
2.- I downloaded the .dmg file from my subscription's account
3.- a screenshot can be found in a post somebody made and who has similar problems as me. 
4.-I've read answers.microsoft.com/.../f66d6f91-1a15-40dd-a012-49b3b3b17535, and only a solution is given for windows machines.
5.- Already checked firewalls,littlesnitch and antivirus in case one of the programs is blocking it.
i hope you can help me a little bit..