I just saw this ad on Reddit: Drop your Excel spreadsheets and \[do whatever\].
That's the same line I've been using since 2014 selling various SaaS platforms. From airlines software (sold to Honeywell) to EU insurance. I think that's over.
Claude for Excel is basically saying, no one needs a siloed interface for this and that and the other. All of these custom interfaces and dashboards that you paid for per seat and through the nose, will be done within Excel. Or a database. Or another data layer depending on the function.
Microsoft will benefit from the demise of the SaaS model because most tools will be on top of the popular apps, ie Office apps. Microsoft has the OFFICE OS rolled out to every single company. That's where the SaaS apps will be rebuilt with AI.
TLDR: Microsoft is a buy at 405. I added some because it's a great entry level with limited downdraft risk.