There is only one file type that uses the .OLK14MSGATTACH extension:
Outlook 2011 Email Message Attachment File
An OLK14MSGATTACH file is a data file created by Microsoft Outlook 2011, an email and calendar program. It contains information about attachments to emails sent and received by a user in Outlook. OLK14MSGATTACH files are similar to .OLK15MSGATTACH files, which are created by Outlook 2016.
OLK14MSGATTACH files are stored in the following directory: [user]/Documents/Microsoft User Data/Office 2011 Identities/Main Identity/Data Records/Message Attachments/
When viewing an email message in Outlook for Mac, the data in the OLK14MSGATTACH file is loaded. The file allows the software to operate more efficiently by loading the information only when the user needs it.
|Microsoft Outlook 365||Free+|
Updated: January 9, 2018