a4 select inbox
* 484 EXISTS
* 0 RECENT
* FLAGS (\Seen \Answered \Flagged \Deleted \Draft $MDNSent)
* OK [PERMANENTFLAGS (\Seen \Answered \Flagged \Deleted \Draft
$MDNSent)] Permanent flags
* OK [UNSEEN 389] Is the first unseen message

So it's the [PERMANENTFLAGS ....] that's killing us. Can we patch VM
to just not use any flags other than those supported? Or to just not
bother sending the command?

Looking at other VM saved traces, I wonder if the problem is that VM
tries to use the '(filed)' flag, and MS Exchange 2010 fails it. But
if VM doesn't do any other IMAP commands, it's fails? I've seen some
other traces where it has these failures, but it's still ok because it
does an EXPUNGE, or more likely:

VM STORE 460 +FLAGS.SILENT (filed)
VM BAD Command Argument Error. 11
VM STORE 461 +FLAGS.SILENT (filed)
VM BAD Command Argument Error. 11
VM STORE 462 +FLAGS.SILENT (filed)
VM BAD Command Argument Error. 11
VM STORE 452:452 +FLAGS.SILENT (\Deleted)
VM OK STORE completed.
VM STORE 456:456 +FLAGS.SILENT (\Deleted)
VM OK STORE completed.
VM STORE 458:458 +FLAGS.SILENT (\Deleted)
VM OK STORE completed.
VM STORE 463:468 +FLAGS.SILENT (\Deleted)
VM OK STORE completed.
VM STORE 470:473 +FLAGS.SILENT (\Deleted)
VM OK STORE completed.
VM EXPUNGE
* 473 EXPUNGE

I suspect it's the OK Store completed. So maybe the handling of
"Command Arguement Error. 11" needs to be changed so it's not a VM
error, just a warning?

John