Maybe not exactly 5000, just lots of em. The reason is that being on Insider requires lots of device resets (at least that seems the standard solution to problems). So if you reduce the sync period and do a reset, years of MMS messages and texts are lost, or so it seems.How do you know the 5000 messages have been deleted? The only way I know to delete archived SMS is to delete them from your device WHILE sync is enabled.
Yes, by now it makes sense, but a warning would have been nice. "If this is your only phone this will delete all older messages from the backup server" or so would have made me think twice.
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