Issues between Exchange 2003 and Outlook 2010

It looks like there are some issues between Exchange 2003 and Outlook 2010 that don’t allow internal users to send to each other. From what I’ve read it’s only internal users and Exchange 2003 that is having this problem. A few people said fix their issue but it didn’t work for me.

I went to the same registry path that the article specifies and increased the NonMAPINamedPropsQuote data to a higher number. I changed it from 8192 to 16000 and it is working now. I picked that number at random and I’m not sure of all the possible ramifications from this but it looks like a safe change. You also need to dismount and remount the store for this to take effect.