Microsoft 365 mailbox reporting issue

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If I look at my mailbox I see a total of 64,382 items in the deleted items as shown above.

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If I then look at my Online Archive I see 44,024 items in the archived deleted item as shown.

This means I have 64,382 + 44,024 = 108,406 items in total in my deleted items.

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If I however run the Exchange Online PowerShell module v2 command as shown above,

get-exomailboxstatistics

it only reports 11,865 items??

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If I look at the Mailbox usage statistics in the Microsoft 365 Admin center reports for 7 days I see 11,637 as the deleted item amount.

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If I look at the Mailbox statistics in the Microsoft 365 Admin center reports for 30 days I see 11,637 as the deleted item amount. The same number as for 7 days.

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Both 90 and 180 day options reveal the same results, Deleted Item Count = 11,637? Why?

Now compare this to Email activity over 7, 30, 90 and 180 days.

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The numbers vary based on the period as you see above. This is what I would expect to also see for Mailbox usage numbers.

If you have a look at:

Microsoft 365 Reports in the admin center – Mailbox usage

It says:

Deleted Item Count refers to the total number of deleted items in the mailbox.

but that is only reporting 11,637 items not the expected 64,382. Also, changing the period of those reports doesn’t change the number of Deleted Items. I would have thought that if the figures shown were total items during that period, they would vary as I changed the period. But they don’t. I would expect a small figure for Deleted Item for 7 days and a larger figure for 180 days say. I wouldn’t expect the same figure for 7, 30, 90 and 180 days!

So there must be something I’m missing here with these numbers? Anyone care to enlighten me?

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