‘Microsoft Outlook’ exited without properly closing your Outlook data file

After an Outlook crash the following error message can occur:

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Outlook Data File
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‘Microsoft Outlook’ exited without properly closing your Outlook data file ‘LocationOfOST.ost’. ‘Microsoft Outlook’ must be restarted. If this error message recurs, contact support for ‘Microsoft Outlook’ for assistance.
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OK

And followed by:

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Microsoft Outlook
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Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened.
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OK
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Before removing your Outlook profile it’s safe to check your processes as one of these processes are used by Outlook as add-in. In my case the process ‘ucmapi64.exe‘ (Microsoft Lync) was causing the issue. After killing the process Outlook was able to start without any problems!

Daniel Nikolic