An hour back, mails more than a week old were suddenly deleted from my Inbox, leaving behind only the mails received in the last 7 days. The other folders (Sent/Junk/Deleted) were not affected. Thankfully, I was able to locate and manually move the deleted mails from the Deleted folder into the Inbox.
I use Exchange ActiveSync with my Nokia N8 phone, but the above mails were still showing in my phone's Inbox at the time.
Also, I have the "Don't let devices or apps delete messages from Outlook. If the app or device is set to delete, Outlook will move the messages to a special POP folder instead." option enabled.
What's going on?