Outlook 2013 is crashing almost immediately upon opening it, on multiple computers.

Question

So, I've got this client.  He's a lawyer, he runs a small law office with four employees to help him in his day-to-day work.  I'm his IT guy, and I recommended that he purchase Office 365.
I am beginning to regret making that recommendation.
Now, obviously, in a small law office, e-mail is a pretty essential part of the office workflow.  The lead guy usually corresponds with his office from his home office 45 miles away.  He does so via e-mail.  He's not exactly a stellar typist,
either, so much to my chagrin, he's more-or-less stuck with Outlook.  If he wasn't so dead-set on using handwriting and ink, I would have him using Mozilla Thunderbird in a heartbeat, because my experience with Outlook tonight has been unbelievable. 
Thunderbird downloaded, and displays 10,000+ e-mails without skipping a beat, and it's free.  Your product costs $100/year, and is crashing on EVERY SINGLE MACHINE.
Each employee has their own IMAP e-mail account from our webhost, InMotionHosting.  My client has three IMAP e-mail accounts -- his main, public-facing account, his internal private correspondence account, and an account to which all newsletters and
such are going to.  Each employee has everyone else's e-mail account on each of their machines, so they can all easily correspond with eachother and keep track of eachother's progress on one matter or another.
The problem:
I fire up Outlook, at which point, it begins to Send/Receive from all accounts.  This lasts about a minute, before I am informed that "Microsoft Outlook has stopped working."  If I try to click on ANY other inbox, again, Outlook crashes. 
I have tried outlook.exe /safe.  I have tried outlook.exe /cleanviews.  I have ensured that I have the latest Windows updates.  I have ensured that I have the latest Office updates.  I have tried the ScanPST.exe utility.  I have tried
deleting my client's profile, and manually re-adding each and every e-mail account.  I have tried a repair install of Outlook.
Nothing.  Works.  Eventually, it gets to a point where Outlook just crashes, and will not stop crashing whenever I open it.  I can only hope that this is happening to millions of other users, and the woeful lack of action on Microsoft's part
will lead to someone, ANYONE, presenting a valid alternative to Outlook.  Your monopoly on office productivity software is obvious to anyone who uses these.

Answer 1

Hi, in case the antivirus software conflicts with Outlook, please disable your security AVG/Firewall, especially the mail scanner module to check whether it would happen again.
For the further steps, please perform a clean boot to troubleshoot the problem:
http://support.microsoft.com/kb/929135/en-us
You may also try Selective Startup to identify problems with conflicting applications.
We can find more information about "Outlook 2010 or Outlook 2013 not responding, hangs, freezes or stopped working" in the link below, in which you can find some possible reasons and the selective startup steps
http://support.microsoft.com/kb/2652320
I hope the suggestion is helpful.
Regards.
Melon Chen
TechNet Community Support