Outlook Limits

Posted on August 22, 2017 by timlyg

Outlook 2016, Outlook 2013 and Outlook 2010:
100,000 items per folder
500 folders total

Outlook 2007:
50,000 items per folder
500 folders total

Source: https://support.microsoft.com/en-us/help/2768656/outlook-performance-issues-when-there-are-too-many-items-or-folders-in

If exceeded, the client will perform slowly.

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