Microsoft does this too. I have a massive mailbox going back 15 years and O365 doesn’t handle it well with full text search... you need to scope it to a person.
Ah this is good to know. I current run on-prem Exchange, with a view to moving to Office365, my mailbox is a super-set of all the mail I've ever had and goes back 20+ years.
My email arching ve going back more than 20 years is stored in a single .PST file, and I search it using Outlook. Never had a problem. Every 3 months I copy everything older than 2 months from Exchange Online into that .PST.
Outlook is totally different, and I agree it works perfectly.
I'm talking about OWA Search in O365. I use mostly VDI these days, so PSTs are out. It's a frustrating issue to me because OWA search is better in many ways for more recent stuff.
Also note this is an anecdotal interpretation based on my experience.
