Outlook keeps crashing or running even after closing.

Outlook crashing  or running even after closing 

Outlook can't close properly if another application is accessing Outlook's message store.this are symptoms which indicate that Outlook is not closing properly include receiving an alert telling you that Outlook is checking the data file when you open it. If you use two Outlook profiles, when you switch profiles you aren't presented the screen to select the profile and Outlook opens directly to the first profile.

Step 1: Try starting Outlook in Safe Mode.

The Outlook safe mode is not equivalent to opening Outlook when your desktop or laptop is booted into safe mode either in Windows XP or Windows 7.

When you start Outlook in Safe mode, many of the customizations you have made to Outlook are not loaded. Instead, they are temporarily replaced with default settings. Also, COM add-ins and Exchange Client Extensions are not loaded so you significantly reduce the number of dlls that interact with Outlook and your data.

To start Outlook in Safe mode, use the /Safe command-line switch. You can tell you are running in Safe mode because the Outlook title bar indicates you are in Safe mode.

You may also see the following prompt when you start Outlook after a crash.

Outlook failed to start correctly last time. Starting Outlook in safe mode
will help you correct or isolate a startup problem in order to successfully start
the program. Some functionality may be disabled in this mode.

Do you want to start Outlook in safe mode?

If you click Yes to this prompt Outlook will launch in Safe mode.  

Step 2: Try disabling Add -ons

In Outlook 2007, you need to go to Tools then select Trust Center

Now select Add-ins, then Select COM Add-ins from the dropdown at the bottom of the dialog

Press Go. Uncheck the add-ins you suspect might be keeping Outlook open then Close the dialog.