Update email versus update speech
Professional communication is getting more efficient, informal, and to the point. Long memos, turn into emails, turn into quick messages. Polite greetings that used to be the protocol in letters are left out.
In certain settings, the formalities of the past are still present. The dinner speech for example. We look back at the past year, summarise our achievements, thank everyone involved. A good speech can be inspiring and a joy to listen to. It can be great to see someone get the thank you she deserves.
A routine speech is boring though: running through a long list of names, waiting for a round of applause for each one of them, becoming softer and softer as the we read down the piece of paper. The audience is polite, but is probably secretly hoping for the thing to be over, and/or, curious to hear what the real news is that is coming at the end of the talk.
When writing an update email (or update-presentation-attachment), the politeness is no longer required, you no longer have a captive audience. People speed read through your paragraphs to the things that really matter.
Keep that in mind when writing it. Make the things that matter stand out. Make that thank you that you really mean stand out.