I want to share with you some helpful resources on Twitter. Firstly, my user assistance team (a group of technical writers who focus on Exchange and FOPE) started a Twitter account called FOPE_UA about five months ago. Feel free to ask us any technical questions. We specialize in FOPE, but we might be able to track down answers for you regarding Exchange or Exchange Online questions too.
Here are some other Twitter accounts that I've found helpful:
Microsoft Exchange "The official handle of the Microsoft Exchange Product Team"
Microsoft Office "Tweets to help you do more with Office at work, home and school."
Mary Jo Foley "I am All About Microsoft" (general Microsoft news)
Microsoft Forefront "The official Twitter account for Microsoft's Identity and Security Business"
Tech Communicator "Tech writer for enterprise antispam, antivirus & data loss prevention apps." (a writer on my team)
Ann Vu "Technical Product Manager for @MSFTExchange..."
Timothy Rich "I produce videos and write help documentation for Forefront Online Protection for Exchange."
...and my Twitter handle tonytri_MSFT.