The messaging interface has returned an unknown error. If theproblem persists, restart Outlook.

[Scottro]

I am using Outlook 2007. Our IT department just migrated us to a new
Exchange server. Everything was working until they did this. Now,
when I attempt to create a new meeting, and click on Scheduling to add
people and find a an open time slot, I get this error. Everything
else seems

I have tried deleting the OST file, disabling Cached Exchange Mode,
etc. based on other posts/solutions, but none of these have worked.

If I attempt to look at a meeting that I previously created, I get
"Item could not be found" in some cases, in other cases, I get the
original error, and then it takes me to the scheduling tab without any
free/busy information displayed for meeting attendees.

Help please. I hope I don't need to roll back to Outlook 2003, but
our IT department does not officially support Outlook 2007, so I know
that is what they would tell me. There has to be a better solution.

Thanks

 

[K. Orland]

Try opening Outlook with the /cleanreminders switch:

Start > Run > outlook.exe /cleanreminders

Also open it again with the /cleanfreebusy switch. Same steps as above.

See if that helps.