Is it normal for my message history to have disappeared?

I am an infrequent user of the forums but have, over the years, messaged a number of users and have always had an archive of these exchanges in my inbox and sent items. Logging on today I find this entire history is gone. Was this discussed previously or was there an event (moving the servers or a hack] that wiped all this out?

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They disappeared with the migration to the new forum software.

I figured as much, thanks for clarifying! Have a great day!