Hi! I'm Eric, a computer expert who's been paired with you through JustAnswer.com. I'm reviewing your question now, and will return w/ an answer soon!
Hi Charles! I'm sorry to hear this happened to you. This particular issue with Windows Live Mail is fairly widespread in cases where users have downgraded back to Windows 7 from Windows 10, but remains unacknowledged by Microsoft. As such, there is no supported "fix" -- but that doesn't mean we can't try!
So, we need to cross our fingers here and hope to find your old mailboxes and contacts in a previous version of your store folder...and, from there, we'll try to restore them:
The biggest potential pitfall here is at step #4...it is possible that there are no previous versions saved of the Store folder, and in that case we'd be up against a wall. However, please do try the above first, and kindly let me know the results!
Hi Charles! It's been a little while since we chatted, so I wanted to check back and see if you had had success reverting back to Windows 7?
Thanks...I hope to hear back from you!