I checked the following:
- Get-ImapSettings
- Get-PopSettings
And both reported that everything was fine. Checking in the Exchange Management Console the banner string says "The Microsoft Exchange IMAP4 (or POP3) service is ready." Note, that's not a status, that's a thing which is displayed when clients connect. But all the settings look fine there too.
What else is there to check? Services. On my Exchange 2010 server I had to set both of these services:
- Microsoft Exchange IMAP4
- Microsoft Exchange POP3
To automatic and then start them. I'm not sure why they aren't set that way to begin with.