I have a number of hotmail & live email accounts I generally access using Thunderbird, with no issues. TBird is set to leave messages on the server until I delete them. I recently went to one of these accounts, which has about 20 emails in the inbox, and ALL I see when I select Inbox on Outlook.live.com is "All caught up." WHAT??? NO messages appear ANYWHERE, except 2 in Junk Mail. It seems once you've READ a message, GONE! WTF? I will continue to use Tbird, but HOW do I get M$ Outlook to actually SHOW the contents of my inbox???




TIA

Thanks to MS's thick-headed naming dept, the usual potential confusion exists. If I interpret you correctly:
You do not use the Outlook client in your Office 2010—or it's not relevant here.

Does that imply that your other accounts do not have the problem you describe?

If that's the case, compare the settings between the 'bad' account and the 'good' accounts—that should identify what's amiss.
Tip: take screenshots or phone photos of the settings if you don't have 2 monitors, makes checking easier.