I have tried looking for a well identified text, found by hand in a very recent email (as of yesterday) and have no result in the search engine from my outlook.com webmail client.
I cannot disclose any screenshot of it publicly here as the data is private, but if a representative of customer support gets in touch and gives me a private communication channel I'll send those proofs over.
This is a major issue as providing customer support and doing daily tasks makes the email search engine absolutely essential.
I am also in dismay when realising how difficult this is to report a bug, not link, no obvious or even un obvious way to report this. I have been a FT software developer for the last 13 years and simply cannot believe I have to resort to googling this and create a user account etc. etc. on techcommunity.microsoft.com.