Migrated several hundred users from exchange 2016 backend to exchange 2019.
Only a handful of users have experienced this search issue.
1) Search from OWA works normal no issues.
2) Search from Outlook thick client (2016 or 2019/365 office) only returns partial results.
Lets say I search for any e-mail from "Joe Average".
E-mail from current date back to 5/26/21 show up fine.
E-mail prior to January 2021 show up fine.
So anything between January and 5/26 do not show up in the search.
However if we scroll down in the inbox back a few months we can manually find it.
Tried to rebuild the index on the thick client.
Tried logging into another desktop, also a laptop, and also a VM. With different versions of office.
Tried moving from one 2019 database to another database.
Search works fine for my mailbox and for others. Only a handful of users out of 500 have reported the issue. Any ideas? Thanks!