Google is kicking off its latest effort to help Gmail users manage their messages -- a redesigned inbox. The new inbox, which will roll out to all Gmail users over the coming weeks, sorts incoming messages into labeled buckets. The messages it deems most important flow into the Primary bucket, while social network notifications from sites like Google Plus are grouped under a Social tab. Email from sites like Groupon announcing vendor deals go into a Promotions category, while receipts and confirmations go into an Updates bucket.