Final answer:
In setting up a business letter through mail merge, saving and merging all are crucial actions, followed by editing and proofreading for accuracy and coherence.
Explanation:
Throughout the mail merge process, the actions that should be done include saving and merging all, which ensures all the personalized documents are combined into one. This process is crucial to generate multiple copies of a document with personalized information. Editing and proofreading are also essential steps to ensure the final merged document is error-free and coherent.
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