Outlook 2016/Exchange 2016 on-prem: inconsistent search across Inbox and In-Place Archives

  • Thread starter Thread starter SteveBinReno
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SteveBinReno

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Environment is on-prem Exchange 2016 Enterprise CU12 with O365 Pro clients (Outlook 2016) running under Win10/Pro. All legally licensed and functionally lashed together. Please note this does not involve OWA at all at this point (that's a whole different issue).

I have a couple users reporting very inconsistent search results when searching from Outlook 2016 across both Current Mailbox and In-Place archive. For example, if we search across ONLY the Current Mailbox (with search parameter set for both Inbox and In-Place Archive), we can see (for example) 150 email items in the result. If we then set the search type "All Mailboxes", we suddenly see fewer than 150 items. At the very least we should see AT LEAST 150 items (those same items from the Current Mailbox search), plus any new items in the In-Place Archive. That is not happening. This is replicable across two (2) separate users at this time; I'm re-indexing my own personal mailbox to test with right now. Multiple re-indexes on the clients; used both cache and non-cached mode (although please say if this is a known issue in searches).

Is this a known bug in Exchange 2016 or Outlook 2016 (any version, including O365)? What's happening here? We can't roll out In-Place Archiving across our enterprise if this feature is broken (we've already done it on a single user with a huge mailbox (100G+) and are taking heat from that user for the failures).

Thanks.

SteveB

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