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The performance of Outlook 2016 for Mac can be affected by the number of folders and calendar items associated with your user profile.

Item

Maximum

Version

Folders

10,000 per profile across mail, calendar, contacts, tasks, and notes. This count includes local folders that aren't part of the online account. These are listed under On My Computer.

Outlook version 15.36 and later

Folders

500 per profile

Outlook version 15.36 and earlier

Calendar items

5,000 per profile

All

Fixes or workarounds for recent issues in Outlook for Mac 

Outlook is running slowly

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