Here's my Exchange issue since upgrading to iOS 5.1:
I have two (2) Exchange accounts on my iPhone 4s. My Gmail account (set up as Exchange) works flawlessly but my native Exchange account (work e-mail) stopped working after the update.
Post update to 5.1: (work Exchange account) I could view my inbox and view individuals emails in the inbox, but I was unable to send any emails. Mail started asking for my password after the update (for the affected Exchange account) but once entered, it failed to verify.
I completley removed the Exchange account and rentered all the account settings but again, failure to verify any information. I was hoping my password might have changed but it did not. Also, maybe the IT guy at the office (not very bright) changed some settings but the only difference is the new iOS update.
And I noticed this: when I receive a new email (any inbox), old emails from multiple inboxes (to include the non-working Exchange account) show up on the pull down notification menu. I clear these out of the notification menu, but they repopulate every time a new email arrives.
Anybody have any ideas? Thanks in advance!
Steve