Missing Office 365 emails

We have Office 365 and appear to be missing nearly a year of emails.  March 15, 2019 starts a gap to Feb 18, 2018.

If I search for received: February the emails will appear.

If I remove that search they go missing again.

Sheldon LivingstonConsultantAsked:
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check from webmail owa if all mails are there

If yes, then change your account settings in outlook to view all emails through slider bar
Sheldon LivingstonConsultantAuthor Commented:
Firstly, I was mistaken... the emails that appear from Feb are Sent emails.

What slide bar Mahesh?
Go to file \ account settings \ account settings
There you will find slider bar, check if its set for less than month or so.
check if mails are not moved in to PST
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Sheldon LivingstonConsultantAuthor Commented:
No joy... no psts on the computer at all.
what about webmail, did you checked?
Sheldon LivingstonConsultantAuthor Commented:
Yes... emails are missing from webmail as well.  Turns out that at least 2 other people are having the same issue.
Then raise call to Microsoft o365 support

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Adam the 32-bit AardvarkSoftware DeveloperCommented:
It also might be a good idea to check if the items are still on the servers. They might have been accidentaly deleted. Running the following cmdlet:
Search-Mailbox -Identity <affected mailbox> -SearchQuery 'received:03/18/2018..03/15/2019' -EstimateResultOnly
This query will allow you to see if the emails are still available for recovery. Replacing -EstimateResultOnly with -TargetMailbox & -TargetFolder attributes will let you recover the emails to the mailbox & folder you point to. Alternatively, you can do the same thing with eDiscovery: How to export Office 365 data to PST with eDiscovery
Sheldon LivingstonConsultantAuthor Commented:
MS Support had to get involved.  Did a content search online to find the missing email, exported it and then imported back into Outlook (thusly Office 365).
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