What is the fine-grained topic of the following text: While working as a video editor, Don came forward with an idea for a corporate community of practice based on an electronic Bulletin Board System (BBS), which also solved a serious technical problem of email file exchange between Macs and PCs. Only return the topic.
Don's idea for a corporate community of practice based on an electronic Bulletin Board System (BBS) to solve email file exchange problem between Macs and PCs.