A “cache,” also known by its file extension, NK2 in older Outlook clients, is a convenience feature in Outlook and Outlook Web App (OWA) which lets users pick recipients from a list of frequently-used recipients.This list is displayed when the end user types in the first few letters.Then Run the following command: To do this press the start button and type ‘run’ press Enter. To import Auto-Complete from one computer running Office 2010 or 2013 to another computer: Copy the Auto-Complete file (usually named Stream_Autocomplete[xxxxxxxxxxxxxxxxxxxx].dat, with a mixture of numbers and letters, see the above image) from the old computer into the same location and paste it in the new.Check the date modified and the size to determine which file is the older one and which is the newer one.The potential issue revolves around end users using those lists to send messages, as the list contains cached recipient information.Because this information is static, it may become invalid at some point.
In newer versions since 2010 theses addresses are in a file called Stream_autocomplete.
Thus, when users pick recipients when sending messages, they may be sending messages to non-existent recipients or invalid e-mail addresses, which create issues like non-delivery of e-mail.
In an earlier version of Outlook, this information was stored in local . In Outlook 2010 and up, this information is stored in your mailbox (Auto Complete Stream).
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