Got lots of experience with Outlook and Exchange here. I could write a book. In any case, you mention you have Multiple Exchange accounts in your Outlook. How many
EXACTLY? And are the Exchange servers in your home or apartment you are connected to? Did you build and do you maintain those Exchange servers?
My guess, is probably not, and you probably have conflicting settings between your various Exchange accounts. I've run into this with my Students who have one Exchange account for their College or Uni and another one for their work. There are also multiple types of Exchange such as Exchange-lite, Exchange-web-portal, and Exchange webmail lite. This complicates things even further. So, if you are using Exchange servers for your various E-mail accounts on school and or work servers where the company or school is physically housing and maintaining those Exchange servers it's easy to run into problems.
I would recommend backing up all your local
.PST and archive .
OST files in your Outlook to external media first. Then, delete ALL your E-mail accounts from your Outlook2013. Then pick one of your Exchange E-mail accounts and reinstall it into your Outlook2013 and test. Does it work or not? If so, then it's one of your other Exchange E-mail accounts that's become corrupted or you have outdated or incorrect server settings or ports in that other Exchange account.
If not, then you need to check all your E-mail account and advanced settings on that 1st account and re-test. You might wish to contact the IT department or IT person that takes care of this particular Exchange server and call them on the phone and have them walk you through the settings. In many large corporations and Uni's they have dedicated folks who do this that are called E-mail administrators. That's who you need to talk to. In some cases, these people are very very busy and don't ever talk to end-users on the phone; you'll need to request a 2nd or 3rd level support person to help you. Once you do that, most likely you'll get to the bottom of it.
Once you've gotten that first Exchange account working ok, then add in your other Exchange E-mail accounts one at a time and retest for your problem; if ok, add another Exchange E-mail account and test again. Repeat this process until you have them all working (I had one Client with 15 different Exchange E-mail accounts!). Finally, add your webmail accounts back into your Outlook2013 one at a time, and continue to test after adding each one as with the Exchange accounts. Most likely those will all go in smoothly for you at that point.
Good luck,
<<<BIGBEARJEDI>>>>