I've found it makes a ton more sense to use either shared drives or SharePoint to collaboratively work on information products (documents, spreadsheets, briefings, etc.), that have multiple collaborators, or an author and multiple recipients. Use of email for information product sharing makes version control unwieldy and unmanageable. This leads to more emails in order to resolve confusion, and rework and redundancy become the order of the day. Repositories such as shared drives or sharepoint enable productive and efficient use of people's time to deal with or use information for decisions and actions. There's a collateral benefit as well, namely that there will no longer be inefficient and duplicative email storage of the products people save in their own computers or storage locations. Memory is cheap, sure, but it's not free.
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