Error message when opening Outlook: The operation failed. The messaging interfaces have returned an unknown error. If the problem persists, restart Outlook.

In an Exchange 2010 server/Outlook 2013 environment, one of our users is getting an error message every time they start Outlook. The error message says: "The operation failed. The messaging interfaces have returned an unknown error. If the problem
persists, restart Outlook."
The error log message details are as follow:
System
Provider
[ Name]
Microsoft Office 15 Alerts
EventID
300
[ Qualifiers]
0
Level
4
Task
0
Keywords
0x80000000000000
TimeCreated
[ SystemTime]
2013-01-08T15:54:49.000000000Z
EventRecordID
655
Channel
OAlerts
Computer
Computer-Name.domain.local
Security
EventData
Microsoft Outlook
The operation failed. The messaging interfaces have returned an unknown error. If the problem persists, restart Outlook.
301670
15.0.4420.1017
xyfc
0x8004011B
The system is as follows:
Size of .pst file: 2.3 GB (Unicode format so there should be plenty of space left)
OS: Windows 7 (64-Bit)
Application: Outlook 2013 (32-Bit)
The user upgraded from Outlook 2010 a few months ago and the error message has only recently started appearing on startup. I thought it was a corrupt mail profile, so I have already tried creating a new mail profile, as well as the repairing tool in Outlook.
I even tested another email account and that worked just fine. So apparently it is something wrong with the specific user's account/profile and not something wrong with the computer - since my email account worked fine on his computer.
Any help would be greatly appreciated.

I had the same error message, only in my situation Outlook would only open successfully every 4 or 5 attempts. When Outlook would open (versus just hanging at the splash screen), I would get two dialog boxes with the warning/error message.
After I clicked okay I could get into Outlook.
Previously I experienced this problem running my Office 2010 client with my Exchange 2007 mailbox on my old laptop. The problem followed my mailbox through an Exchange 2010 migration (so new Exchange org), client upgrade to Outlook 2013, and a new
laptop (so I knew it wasn't a corrupt profile). This led me to the conclusion that it was a corrupt item(s) in my mailbox.
To resolve the issue, I archived *everything* in my mailbox to a PST file, ran SCANPST to fix the corruption, and then uploaded everything back into my Exchange mailbox one folder at a time, stopping after each folder to close and restart Outlook so I could
narrow down which folder had the corrupt item if the problem recurred. I'm happy to say my issue is now resolved.

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