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slow mail delivery with large 365 mailboxes

dougdog asked
Last Modified: 2018-03-14
we seem to have an issue with some mailboxes that have been migrated to 365
mail delivery can be very slow
these mailboxes can be around 40gig
sometimes mail has been delivered to the cell phone long before the desktop
if we removed cached mode it seems to be better
is this due to the large cache ost file
would archive fix this maybe?
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